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Why "Attempt to grow array along ambiguous dimension." only for some images?

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Siegmund Nuyts
Siegmund Nuyts le 11 Mar 2022
Commenté : Walter Roberson le 12 Mar 2022
I am analysing images in MATLAB and the code I have is running fine for most images.
I get the error: "Attempt to grow array along ambiguous dimension." for some images.
Why is this happening? I assume that the code is correct, as it works for most images...
The code runs into the issue here:
%Extract contour
RminusBdouble = double(Iplan(:,:,1))- double(Iplan(:,:,3));
%Mask out data outside of ROI (ROI determined from transects)
ROIx = [transects.x(1,:) fliplr(transects.x(2,:))]; %Transects file determines the ROI
ROIy = [transects.y(1,:) fliplr(transects.y(2,:))]; %Transects file determines the ROI
Imask = ~inpoly([X(:) Y(:)],[ROIx',ROIy']); %use the function inpoly instead of inpolygon as it is much faster
RminusBdouble(Imask) = NaN; %Mask data
%Imask = find(RminusBdouble==0); %Also remove regions of black colour
%RminusBdouble(Imask) = NaN; %Mask data
c = contours(X,Y,RminusBdouble,[thresh thresh]);
  1 commentaire
Siegmund Nuyts
Siegmund Nuyts le 11 Mar 2022
The issue is resolved now.
I recalled an array with different dimensions, which caused the error.

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Réponses (2)

Walter Roberson
Walter Roberson le 11 Mar 2022
In arrays, the X coordinate is the second coordinate, not the first.
  2 commentaires
Siegmund Nuyts
Siegmund Nuyts le 11 Mar 2022
Thanks. I tried changing that but the issue remains...
Also, the code works for some images but not all of them so I'd think the fundamentals of the code are correct?
Walter Roberson
Walter Roberson le 12 Mar 2022
How are you building X and Y for the inpoly test ?

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yanqi liu
yanqi liu le 12 Mar 2022
yes,sir,may be check
size(Iplan)
if is 2 dimension,may be can not use Iplan(:,:,3)

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