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

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]);
    

[Siegmund Nuyts]

The issue is resolved now.

I recalled an array with different dimensions, which caused the error.

Answer 1

[Walter Roberson]

In arrays, the X coordinate is the second coordinate, not the first.

[Siegmund Nuyts]

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]

How are you building X and Y for the inpoly test ?

Answer 2

[yanqi liu]

yes，sir，may be check

size(Iplan)

if is 2 dimension，may be can not use Iplan(:,:,3)