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# 2 dimensional plot problem

Asked by XJ on 27 Apr 2013

Hi,

I have written a program for a Crank-Nicolson scheme using MATLAB. I have solutions for u(x,t) at x=0:0.1:1.0, at t intervals of 0, 0.005, 0.001, 0.015 and 0.02.

We have the exact solution available, and are required to plot the difference between the exact and calculated values of u(x,t) with respect to x and t.

I am not sure how to do this, any help would be much appreciated.

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## 1 Answer

Answer by the cyclist on 27 Apr 2013

My recommendation would be to go to the Plot Gallery: http://www.mathworks.com/discovery/gallery.html.

There you will find example of plots, along with the code that generates them. I expect you will be able to adapt one of them to your needs.

## 1 Comment

XJ on 28 Apr 2013

Hi, thanks for the answer.

The problem is, say I wanted to do a 3D bar plot, I currently have the u values, but I'm not sure how to specify the x and t values that they are at. For instance, I have a column matrix of 11 u values from x=0 to x=1 in intervals of 0.1, at time t=0, the same for time t=0.005, and so on, but I don't know how to plot this.

Many thanks.

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