MATLAB: Use 3×3 Matrix to create 9×15 Matrix.

matrix manipulation

What would be the simplest approach to use a 3×3 Matrix (the one in the left corner) to create this one (9×15).

Best Answer

Well here is one way:

% Define the 3 by 3 matrix.
array3x3 = [1 2 3; 4, 5, 6; 7, 8, 9];
% Create the top and middle bands.
band1 = repmat([array3x3, zeros(3)], 1, 3)
band2 = circshift(band1, 3, 2)
% Stack them vertically.
final9x15 = [band1(:, 1:15); band2(:, 1:15); band1(:, 1:15)]

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MATLAB: How to make a 3×3 matrix a 9×1 matrix

 reshape(x,9,1)

 x(:) % this creates a column vector out of a matrix

MATLAB: HI,i want user defined band of image in multiband image processing in GUI in matlab.In the belowUI code ,it is default selected band as 4,3,2 ,but i want this to be user defined in GUI.

Have 3 edit fields, one for each ban. The user can type into it. If you're using GUIDE, you can do

band1 = str2double(handles.edtBand1.String);
band2 = str2double(handles.edtBand2.String);
band3 = str2double(handles.edtBand3.String);
bandsToUse = [band1, band2, band3];
multiBandImage = multibandread('paris.lan', [512, 512, 7], 'uint8=>uint8',...
                    128, 'bil', 'ieee-le', {'Band','Direct',bandsToUse });
imshow(multiBandImage)

Best Answer

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MATLAB: How to make a 3×3 matrix a 9×1 matrix

MATLAB: HI,i want user defined band of image in multiband image processing in GUI in matlab.In the belowUI code ,it is default selected band as 4,3,2 ,but i want this to be user defined in GUI.

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