Plot contour on similarity matrix

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Virtualkeeda
Virtualkeeda 2020-4-28
评论： Star Strider 2020-4-30
I need to plot the contour which looks like the image. The image shows the contour of the laplacian kernel (similarity matrix)
I need to plot such contour on my similarity matrx (nxn) ....lets say the similarity matrix is built from the eucledian distance....

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Star Strider
Star Strider 2020-4-28
Use the surfc function.
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Virtualkeeda
Virtualkeeda 2020-4-30
That is indeed a similarity matrix (verified with properties) as you can see the diagonal element is 1 depicting the maximum similarity of 1 if element is same, rest are other similarities.
Do you have atleat idea about what Z constitues in surfc (X,Y,Z)? they used Z=peaks(X,Y). So what each value in the matrix Z says about X and Y?
Star Strider
Star Strider 2020-4-30
The ‘Z’ matrix is what you specify it to be. (Note that ‘X’ and ‘Y’ are not required for surfc. In their absence, those values are set to the indices of the respective dimensions.)

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