CoCalc -- plotting

GitHub Repository: hackassin/Coursera-Machine-Learning
Path: blob/master/Week 2/Octave Tutorial/4. Plotting Data/plotting_data.txt
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GNU Octave, version 4.4.1
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Copyright (C) 2018 John W. Eaton and others.
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This is free software; see the source code for copying conditions.
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There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  For details, type 'warranty'.
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Octave was configured for "x86_64-w64-mingw32".
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Additional information about Octave is available at https://www.octave.org.
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Please contribute if you find this software useful.
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For more information, visit https://www.octave.org/get-involved.html
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Read https://www.octave.org/bugs.html to learn how to submit bug reports.
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For information about changes from previous versions, type 'news'.
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octave:1> t = [0:0.01:0.98]
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t =
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 Columns 1 through 11:
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   0.00000   0.01000   0.02000   0.03000   0.04000   0.05000   0.06000   0.07000   0.08000   0.09000   0.10000
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 Columns 12 through 22:
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   0.11000   0.12000   0.13000   0.14000   0.15000   0.16000   0.17000   0.18000   0.19000   0.20000   0.21000
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 Columns 23 through 33:
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   0.22000   0.23000   0.24000   0.25000   0.26000   0.27000   0.28000   0.29000   0.30000   0.31000   0.32000
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 Columns 34 through 44:
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   0.33000   0.34000   0.35000   0.36000   0.37000   0.38000   0.39000   0.40000   0.41000   0.42000   0.43000
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 Columns 45 through 55:
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   0.44000   0.45000   0.46000   0.47000   0.48000   0.49000   0.50000   0.51000   0.52000   0.53000   0.54000
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 Columns 56 through 66:
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   0.55000   0.56000   0.57000   0.58000   0.59000   0.60000   0.61000   0.62000   0.63000   0.64000   0.65000
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 Columns 67 through 77:
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   0.66000   0.67000   0.68000   0.69000   0.70000   0.71000   0.72000   0.73000   0.74000   0.75000   0.76000
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 Columns 78 through 88:
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   0.77000   0.78000   0.79000   0.80000   0.81000   0.82000   0.83000   0.84000   0.85000   0.86000   0.87000
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 Columns 89 through 99:
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   0.88000   0.89000   0.90000   0.91000   0.92000   0.93000   0.94000   0.95000   0.96000   0.97000   0.98000
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octave:2> y1 = sin(2*pi*4t)
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parse error:
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  syntax error
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>>> y1 = sin(2*pi*4t)
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                   ^
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octave:2> y1 = sin(2*pi*4*t)
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y1 =
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 Columns 1 through 11:
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   0.00000   0.24869   0.48175   0.68455   0.84433   0.95106   0.99803   0.98229   0.90483   0.77051   0.58779
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 Columns 12 through 22:
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   0.36812   0.12533  -0.12533  -0.36812  -0.58779  -0.77051  -0.90483  -0.98229  -0.99803  -0.95106  -0.84433
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 Columns 23 through 33:
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  -0.68455  -0.48175  -0.24869  -0.00000   0.24869   0.48175   0.68455   0.84433   0.95106   0.99803   0.98229
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 Columns 34 through 44:
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   0.90483   0.77051   0.58779   0.36812   0.12533  -0.12533  -0.36812  -0.58779  -0.77051  -0.90483  -0.98229
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 Columns 45 through 55:
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  -0.99803  -0.95106  -0.84433  -0.68455  -0.48175  -0.24869  -0.00000   0.24869   0.48175   0.68455   0.84433
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 Columns 56 through 66:
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   0.95106   0.99803   0.98229   0.90483   0.77051   0.58779   0.36812   0.12533  -0.12533  -0.36812  -0.58779
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 Columns 67 through 77:
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  -0.77051  -0.90483  -0.98229  -0.99803  -0.95106  -0.84433  -0.68455  -0.48175  -0.24869  -0.00000   0.24869
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 Columns 78 through 88:
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   0.48175   0.68455   0.84433   0.95106   0.99803   0.98229   0.90483   0.77051   0.58779   0.36812   0.12533
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 Columns 89 through 99:
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  -0.12533  -0.36812  -0.58779  -0.77051  -0.90483  -0.98229  -0.99803  -0.95106  -0.84433  -0.68455  -0.48175
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octave:3> y2 = cos(2*pi*4*t)
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y2 =
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 Columns 1 through 10:
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   1.000000   0.968583   0.876307   0.728969   0.535827   0.309017   0.062791  -0.187381  -0.425779  -0.637424
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 Columns 11 through 20:
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  -0.809017  -0.929776  -0.992115  -0.992115  -0.929776  -0.809017  -0.637424  -0.425779  -0.187381   0.062791
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 Columns 21 through 30:
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   0.309017   0.535827   0.728969   0.876307   0.968583   1.000000   0.968583   0.876307   0.728969   0.535827
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 Columns 31 through 40:
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   0.309017   0.062791  -0.187381  -0.425779  -0.637424  -0.809017  -0.929776  -0.992115  -0.992115  -0.929776
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 Columns 41 through 50:
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  -0.809017  -0.637424  -0.425779  -0.187381   0.062791   0.309017   0.535827   0.728969   0.876307   0.968583
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 Columns 51 through 60:
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   1.000000   0.968583   0.876307   0.728969   0.535827   0.309017   0.062791  -0.187381  -0.425779  -0.637424
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 Columns 61 through 70:
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  -0.809017  -0.929776  -0.992115  -0.992115  -0.929776  -0.809017  -0.637424  -0.425779  -0.187381   0.062791
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 Columns 71 through 80:
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   0.309017   0.535827   0.728969   0.876307   0.968583   1.000000   0.968583   0.876307   0.728969   0.535827
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 Columns 81 through 90:
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   0.309017   0.062791  -0.187381  -0.425779  -0.637424  -0.809017  -0.929776  -0.992115  -0.992115  -0.929776
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 Columns 91 through 99:
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  -0.809017  -0.637424  -0.425779  -0.187381   0.062791   0.309017   0.535827   0.728969   0.876307
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octave:4> plot(t,y2);
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octave:5> plot(t,y1);
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octave:6> plot(t,y2);
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octave:7> plot(t,y1);
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octave:8> plot(t,y2);
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octave:9> plot(t,y1);
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octave:10> hold on;
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octave:11> plot(t,y2,'r');
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octave:12> xlabel('time');
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octave:13> ylabel('value');
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octave:14> legend('sin','cos');
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octave:15> title('Merged Plot');
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octave:16> figure(1);
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octave:17> plot(t,y1);
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octave:18> figure(2);
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octave:19> plot(t,y2);
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octave:20> subplot(1,2,1); #Divides plot 1x2 grid (1st two args, last arg: 1st element)
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octave:21> plot(t,y1);#plot the sine graph in the 1sy grid
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octave:22> plot(t,y2);#plot the cosine graph in the 1st grid
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octave:23> subplot(1,2,2);
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octave:24> plot(t,y2);#plot the cosine graph in the 2nd grid
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octave:25> plot(t,y2);#plot the cosine graph in the 2nd grid
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#line 21-25 gave me wrong output because I plotted the 2nd one in 1st grid
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octave:26> subplot(1,2,1);
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octave:27> plot(t,y1);
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octave:28> subplot(1,2,2);
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octave:29> plot(t,y2);
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octave:30> axis([0.5 1 -1 1])
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octave:31> #Range - vertical: 0.5 -1, horizontal: -1 1
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octave:31> clf; #clear figure
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octave:32> subplot(1,2,1);
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octave:33> plot(t,y1);
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octave:34> subplot(1,2,2);
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octave:35> plot(t,y2);
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octave:36> clf;
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octave:37> A = magic(5)
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A =
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   17   24    1    8   15
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   23    5    7   14   16
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    4    6   13   20   22
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   10   12   19   21    3
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   11   18   25    2    9
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octave:38> imagesc(A); #Plots a 5x5 grid with diff colors
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octave:39> color bar
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warning: the 'color' function belongs to the optim package from Octave Forge
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which you have installed but not loaded.  To load the package, run 'pkg
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load optim' from the Octave prompt.
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Please read <https://www.octave.org/missing.html> to learn how you can
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contribute missing functionality.
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error: 'color' undefined near line 1 column 1
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octave:39> pkg load optim
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octave:40> color bar
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warning: the 'color' function belongs to the optim package from Octave Forge but
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has not yet been implemented.
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Please read <https://www.octave.org/missing.html> to learn how you can
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contribute missing functionality.
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error: 'color' undefined near line 1 column 1
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octave:40> colorbar
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octave:41> imagesc(A), colorbar, colormap(green);
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error: 'green' undefined near line 1 column 32
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octave:41> imagesc(A), colorbar, colormap green;
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error: colormap: failed to set MAP <green>
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error: called from
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    colormap at line 111 column 11
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octave:41> imagesc(A), colorbar, colormap gray;
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octave:42> imagesc(A), colorbar, colormap blue;
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error: colormap: failed to set MAP <blue>
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error: called from
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    colormap at line 111 column 11
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octave:42> help colormap;
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'colormap' is a function from the file C:\Octave\OCTAVE~1.1\share\octave\4.4.1\m\image\colormap.m
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 -- CMAP = colormap ()
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 -- CMAP = colormap (MAP)
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 -- CMAP = colormap ("default")
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 -- CMAP = colormap (MAP_NAME)
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 -- CMAP = colormap (HAX, ...)
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 -- colormap MAP_NAME
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     Query or set the current colormap.
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     With no input arguments, 'colormap' returns the current color map.
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     'colormap (MAP)' sets the current colormap to MAP.  The colormap
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     should be an N row by 3 column matrix.  The columns contain red,
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     green, and blue intensities respectively.  All entries must be
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     between 0 and 1 inclusive.  The new colormap is returned.
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     'colormap ("default")' restores the default colormap (the 'viridis'
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     map with 64 entries).  The default colormap is returned.
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     The map may also be specified by a string, MAP_NAME, which is the
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     name of a function that returns a colormap.
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     If the first argument HAX is an axes handle, then the colormap for
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     those axes is queried or set.
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     For convenience, it is also possible to use this function with the
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     command form, 'colormap MAP_NAME'.
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     The list of built-in colormaps is:
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     Map         Description
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     --------------------------------------------------------------------------
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     viridis     default
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     jet         colormap traversing blue, cyan, green, yellow, red.
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     cubehelix   colormap traversing black, blue, green, red, white with
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                 increasing intensity.
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     hsv         cyclic colormap traversing Hue, Saturation, Value space.
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     rainbow     colormap traversing red, yellow, blue, green, violet.
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     ---------   --------------------------------------------------------------
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     hot         colormap traversing black, red, orange, yellow, white.
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     cool        colormap traversing cyan, purple, magenta.
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     spring      colormap traversing magenta to yellow.
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     summer      colormap traversing green to yellow.
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     autumn      colormap traversing red, orange, yellow.
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     winter      colormap traversing blue to green.
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     ---------   --------------------------------------------------------------
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     gray        colormap traversing black to white in shades of gray.
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     bone        colormap traversing black, gray-blue, white.
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     copper      colormap traversing black to light copper.
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     pink        colormap traversing black, gray-pink, white.
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     ocean       colormap traversing black, dark-blue, white.
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     ---------   --------------------------------------------------------------
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     colorcube   equally spaced colors in RGB color space.
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     flag        cyclic 4-color map of red, white, blue, black.
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     lines       cyclic colormap with colors from axes "ColorOrder"
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                 property.
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     prism       cyclic 6-color map of red, orange, yellow, green, blue,
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                 violet.
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     ---------   --------------------------------------------------------------
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     white       all white colormap (no colors).
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     See also: viridis, jet, cubehelix, hsv, rainbow, hot, cool, spring,
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     summer, autumn, winter, gray, bone, copper, pink, ocean, colorcube,
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     flag, lines, prism, white.
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Additional help for built-in functions and operators is
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available in the online version of the manual.  Use the command
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'doc <topic>' to search the manual index.
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Help and information about Octave is also available on the WWW
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at https://www.octave.org and via the [email protected]
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mailing list.
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octave:43> imagesc(A), colorbar, colormap ocean;
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octave:44> imagesc(A), colorbar, colormap copper;
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octave:45> imagesc(A), colorbar, colormap prism;
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octave:46> imagesc(A), colorbar, colormap flag;
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octave:47> imagesc(A), colorbar, colormap lines;
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octave:48> imagesc(A), colorbar, colormap colorcube;
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octave:49> imagesc(A), colorbar, colormap cubehelix;
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octave:50> imagesc(A), colorbar, colormap hsv;
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