Vector field graph from a data file.

I am totally new to Matlab. I have data on file. I need to draw a 2-D vector field graph of the data.

I would appreciate detailed instructions as this is my first attempt as using Matlab.

Much apprrciate any advice.

Regards

Answer 1

[Voss]

readmatrix might be useful to read the file, and quiver might be useful to create the plot.

[Munawar Karim]

OK I will follow your suggestion.

Thanks

[Munawar Karim]

I am afraid because I am new to Matlab I have yet to learn the commands, syntax etc.

If you can provide more details it will help.

Many thanks

[Voss]

Upload your data file here (using the paperclip button), and post the code you have tried so far, and I'll take a look.

[Munawar Karim]

I have uploaded my data file.

The range of values is huge so I have entered the log of the numbers.

Regreatbly no idea how to proceed.

Thanks again.

[Voss]

Thanks for the file. Here is some example code that reads the file and creates a quiver plot; you can use it as a reference and adapt it to make the plot you actually want to see.

M = readmatrix('Compilation4.xlsx')

M = 759x11

1.0e+05 * 0.0000 0.0000 0.0000 0.0000 0.0000 1.3040 0.0114 -0.0003 -0.0004 0.0001 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.3038 0.0228 -0.0003 -0.0004 0.0001 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.3032 0.0455 -0.0003 -0.0004 0.0001 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.3022 0.0682 -0.0003 -0.0004 0.0001 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.3008 0.0910 -0.0003 -0.0004 0.0001 0.0000 0.0000 0.0000 0.0000 0.0000 0.0001 1.2990 0.1137 -0.0003 -0.0004 0.0001 0.0000 0.0000 0.0000 0.0000 0.0000 0.0001 1.2842 0.2264 -0.0003 -0.0003 0.0001 0.0000 0.0000 0.0000 0.0000 0.0000 0.0001 1.2596 0.3375 -0.0003 -0.0003 0.0001 0.0000 0.0000 0.0000 0.0000 0.0000 0.0002 1.2254 0.4460 -0.0003 -0.0003 0.0001 0.0000 0.0000 0.0000 0.0000 0.0000 0.0003 1.1818 0.5511 -0.0003 -0.0003 0.0001 0.0000

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x = M(:,1);
y = M(:,2);
u = cos(M(:,3));
v = sin(M(:,3));
quiver(x,y,u,v)