??? Subscripted assignment dimension mismatch.

As P is a 3x3 matrix, then P(3,3) is a scalar (so 1x1 element). If p is a scalar, then the above will work. But if p is an array or matrix (so anything other than a 1x1) then you will observe this error.

For example, consider the following code

 P=zeros(3,3);
 p = 42;
 P(3,3)   = p;  % scalar assignment works
 p = [42 42]; 
 P(3,3)   = p;  % assignment of vector to scalar fails
 P(3,1:2) = p;  % assignment of vector to a vector works

So the dimensions of what you are trying to assign (the "source") must match the dimensions of the "destination". So what are you trying to assign to this element of P? What are the dimensions of p?

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Geoff Hayes 2014-11-23

Fred - what format is the data in now? If it is just in a text file, perhaps a comma separated file with three columns for a, b, and c, then you can use importdata or csvread. Start with this.

Once you have read in your data, presumably into a 20x3 matrix, you can then iterate over each row of the matrix and extract the three different values. You would then pass these three values into your function, and store the result somewhere. Whether you would "store" this in P(3,3) remains to be seen. Perhaps you will have 20 such P matrices.

Fred John 2014-11-23

Yes, 20 different matrices of P. I'll have a crack at that and see what happens. This is the beginning of my code so I'll probably be posting more questions!

Thanks Geoff

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