MATLAB: Error: Expected input to be a vector

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Hi folks,
I am calling a self-made function as follows: 
ir = rotateAround(ig, Cy, Cx, Angle_DEG);
But the last variable, Angle_DEG, has no value so I get an error when calling this function. Angle_DEG is returned bu a different function as:
[Angle_DEG, LinePoint1, LinePoint2] = RotatedAngle(RawImages, files, xmin, ymin, CropH, CropW, a, i);
where rotatedAngle is returning all outputs without an actual numeric value…Any ideas why this might be please? The function is defined as follows:
function [ Angle_DEG, LinePoint1, LinePoint2] = RotatedAngle( RawImages, files, xmin, ymin, CropH, CropW, a, i )
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
%   Finding the angle for auto rotation of the image
%   Then recropping to remove the black edges due to rotation
  %% Finding the Image rotation based on the initial image %%
        file_name = files(i).name;
        im = imread([RawImages '\' file_name]);
        ig = rgb2gray(im(:,:,1:3));
        I = imcrop(ig,[xmin(i) ymin(i) CropW(a) CropH(a)]);       
%%% Using edge detection %%%        
        Bw = imbinarize(I, 24/255);
        IE = edge(Bw,'canny');
        %imshow(IE);
        %IE = edge(I,'canny',0.25);  %IE = edge(I,'canny',0.23)        
%% Getting data points for the tile %%    
    % (X1,Y1) Point on the left        
    X1 = round((size(IE,2))*1/10);
    X1line = IE(:,X1);    
    Y1s = find(X1line==1,500);            
    Y1s(Y1s == 0) = inf;
    LinePoint1 = max(Y1s,[],1);        
    % (X2,Y2) Point on the right
    X2 = round((size(IE,2))*9/10);
    X2line = IE(:,X2);    
    Y2s = find(X2line==1,500);
    Y2s(Y2s == 0) = inf;
    LinePoint2 = max(Y2s,[],1);
    %Y2Table(i) = Y2;
 %Angle between the line and the horizontal
     Coordinates = [X1,LinePoint1;X2,LinePoint2];
     Dist = pdist(Coordinates,'euclidean'); % not necessary     
     Angle_DEG = atan2(LinePoint2-LinePoint1,X2-X1)*180/pi;
end

Best Answer

It seems to me Cy and Cx must be column vectors, that is how I could reproduce the error. The function can only handle scalars for Cy and Cx. If you need to rotate your image around many points, I suggest you do it in a loop instead.
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