Is it possible to use surf function calling parameters from a 4-D matrix?

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bugatti79
bugatti79 2013-9-29
评论： bugatti79 2013-10-1
I have an equation which is a fn of four variables. So i created a 4-D matrix to calculate an output, ie Output=f(a,b,c,d) inside a multi for loop of 4.
Now I wish to use the surf command to plot Output as fn of any above 2 variables.
It seems I can only plot a surface if the matrix is of the form Output=f(a,b,c), ie
surf(a,b,output(:,:,1,1)
It does not accept any other variation like
surf(a,b,output(1,:,:,1) etc
So am i restricted to Output=f(a,b,c) inside the for loop?
Thanks in advanced

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Wayne King
Wayne King 2013-9-29
You can use squeeze() to do this
output = randn(20,20,20,20);
surf(squeeze(output(1,:,:,1)))
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bugatti79
bugatti79 2013-10-1
编辑：bugatti79 2013-10-1
Hi Wayne, I have come across some confusion when selecting parameters from the 4D matrix into the surf command.
Referring to my original message, say I want to issue the following
surf(c,d,squeeze(output(1,1:,:))).
Sometimes the squeeze(output) is a row vector instead of a column vector and it doesn't match with the inputs c,d. So I end up transposing the squeeze(output) and the result 'looks right' but I am doing it rather blindly. So the question I have is
1)If the inputs are column vectors then the output must also be a matching column vector and so I must transpose in order to achieve this?
2)Does the matching work in chronological order? ie,
surf(a,b, squeeze(output(:,:,1,1)
surf(b,c, squeeze(output(1,:,:,1)
surf(c,d, squeeze(output(1,1,:,:)
surf(a,d, squeeze(output(:,1,1,:) etc
Thanks in advanced.

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