mnist file to mat in matlab

main.m
function data = loadMNISTImages(filename)
% This function reads in MNIST images and returns them in a matrix
fp = fopen(filename, 'rb');
assert(fp ~= -1, ['Could not open ', filename, '']);

magic = fread(fp, 1, 'int32', 0, 'ieee-be');
assert(magic == 2051, ['Bad magic number in ', filename, '']);

numImages = fread(fp, 1, 'int32', 0, 'ieee-be');
numRows = fread(fp, 1, 'int32', 0, 'ieee-be');
numCols = fread(fp, 1, 'int32', 0, 'ieee-be');

data = fread(fp, inf, 'unsigned char');
data = reshape(data, numCols, numRows, numImages);
data = permute(data,[2 1 3]);

fclose(fp);
end
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main.m
images = loadMNISTImages('train-images-idx3-ubyte');
imshow(images(:,:,1)');
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