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How can I create an x,y plot where the grid spacing is not equal?

Asked by Rob on 16 Jan 2013

I have a 5x50 matrix of temperature measurements taken across a metal plate which I would like to plot. The spacing of the x-axis measurements was 1.1cm and the y-axis was 0.6cm. Somehow I need to plot the measurements according to this spacing and interpolate the temperatures between the measurements. Here's what I have so far:

    % Temperature data is stored in T
    [X,Y]=meshgrid(0:1.1:4.9,-15:0.6:14.4);
    contourf(X,Y,T)
    title('Temperature Distribution')

I am not convinced this is producing the correct result also, I am not able to interpolate the shading when using contourf, if there a better plot to use?

2 Comments

Doug Hull on 16 Jan 2013

What makes you think this is incorrect?

What is the purpose of the visualization?

Rob on 16 Jan 2013

I thought it was incorrect because of the shape of the contours it produced, that may just be the nature of the temperatures recorded but I wanted to rule out it was a problem with my code first.

The visualization is simply there to give the reader an overview of how well the plate is conducting heat so I need to produce the same plot for different values of time.

Rob

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1 Answer

Answer by Irl on 16 Jan 2013

You might prefer to interpolate the data first, before plotting. Look at the help for interp2, perhaps with method set to bicubic.

1 Comment

Rob on 16 Jan 2013

Thanks, I'll take a look. Is this better than using 'shading interp'?

Irl

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