Is there a function for inverting the 'reshape' command?

2016 9 3
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更新时间：2016 9 3
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For my rail fence cipher, i obtain the correct output. But am wondering if there is a simple command to decipher the output?
function cipher_text = rail_fence_cipher(origionalText,key)
origionalText = [origionalText,origionalText(1:(key-mod(length(origionalText),key)))];
cipher_text = reshape(origionalText,key,[]);
end

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