display first image in matrix in matlab

To display the first image in a matrix in MATLAB, you can use the imshow function along with indexing to extract the first image from the matrix. Here's an example code snippet:

main.m
% create a 3D matrix of 3 grayscale images
img = zeros(100, 100, 3);
img(:, :, 1) = ones(100, 100); % first image
img(:, :, 2) = 0.5 * ones(100, 100); % second image
img(:, :, 3) = 0.2 * ones(100, 100); % third image

% display the first image
figure;
imshow(img(:, :, 1));
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In this example, we create a 3D matrix with three grayscale images of size 100x100. Each image is represented as a 2D slice of the matrix, and we set the values of the first slice to 1 (indicating full white). We then use the imshow function and indexing to display the first image in a new figure window.