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Different values in matrix and in the plot of image

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Joaquim
Joaquim on 27 Jan 2017
Answered: Adam on 27 Jan 2017
Hello everybody,
I have a matrix A with double precision, 198*198 of size.Ploting the image using imshow(A,[]) and search using the Data cursor the value for the voxel (90,90) I get a value x, which is expected. However, using the command window to obtain the same value A(90,90) the value that I obtain is completely different of x. Can somebody explain why this happens and how can I get the value x in the command window?
Thank you in advance, Joaquim

  3 Comments

Adam
Adam on 27 Jan 2017
Are you sure this happens with (90,90) specifically?
You have to be careful with X,Y and rows, columns when indexing into a matrix. To get the value reported as X,Y you need to index your data as data(Y,X) although obviously for 90,90 this would make no difference,
Joaquim
Joaquim on 27 Jan 2017
(90,90) was just an example. Thank you, it solved the problem!
Adam
Adam on 27 Jan 2017
I'll add it as an answer then. Given that example I wasn't confident it was a solution, hence the comment instead.

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Adam
Adam on 27 Jan 2017
You have to be careful with X,Y and rows, columns when indexing into a matrix. To get the value reported as X,Y you need to index your data as data(Y,X) although obviously for 90,90 this would make no difference.

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