Display imagesc within a shape

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Alessandro Masullo
Alessandro Masullo 2012-10-19
Hi! I have a matrix of values that refer to the stress on a trapezoidal shape. Now, I would like to show the intensity of the stresses on the shape. If I use imagesc, I can see the stresses on a square... How could I reshape imagesc to fit my trapezoidal shape?
Thank you.

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Alessandro Masullo
Alessandro Masullo 2012-10-20
The problem is that my matrix is rectangular shape, but it refers to a trapezoidal shape, so I should reshape the content of the matrix to fit the shape. The function I would like to use is is a sort of "area()" with the content of imagesc().
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Image Analyst
Image Analyst 2012-10-20
编辑：Image Analyst 2012-10-20
No, you use imtransform on the image to create a new rectangular image just for display. Then use imagesc() for displaying it. (By the way you should have accepted my answer rather than yours.) Why don't you post your data/image so we can see what you're talking about?
Alessandro Masullo
Alessandro Masullo 2012-10-20
I would like to choose your answer, but your answer is a comment to my answer (that is a comment!)
However, I have this shape:
xW = [0 150 190 150 37 0];
yW = [0 0 0 42 60 60];
area(xW, yW)
I have done some calculations on this area (it's a wing) considering it section by section, each section of the same length, because length doesn't effect these calculations. The result of these calculations is, as expected, a rectangular matrix. Now I would transform the imagesc() of this matrix to fit the initial area.

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Image Analyst
Image Analyst 2012-10-19
Axes must be rectangular. imagesc() uses some arbitrary colormap. If your stresses are zero outside the trapezoid and show up as blue, you could use a different colormap - one that had zero being black or the same gray as the rest of your figure if you didn't want the zeros to show up as blue.

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