how to retrive the image of size 64*64 pixel from its one dimensional form

when i'm decoding an image of size 64*64 i'm getting an image of size of 4096*1. what is the code for converting

[Stephen23]

Duplicate:

https://www.mathworks.com/matlabcentral/answers/389753-what-is-the-method-to-retrive-an-image-of-size-of-256-256-unit8-pixel-which-is-in-its-one-dimension