how to subtract from every element in an array

I have a very large double array in which every element needs to have 300 subtracted from it due to a mis calibration how do i do this?

Answer 1

[Jan]

X = rand(100, 100);  % Example data
Y = X - 300;

So, you see, it is as trivial as possible. Please note, that reading the Getting Started chapters from the documentation clears such questions efficiently.

[Stephen23]

http://www.mathworks.com/help/matlab/getting-started-with-matlab.html

Answer 2

[Calum Yates]

Will that subtract 300 from every individual element in the overall array then?

[Stephen23]

Try it and see! Your computer will not explode if you do a little experimentation:

>> [1,2;3,4] - 600
ans =
  -599  -598
  -597  -596

Or alternatively you could actually read the documentation for minus, which has an example of subtracting a scalar from a matrix, complete with the text "The scalar is subtracted from each entry of A."

[Image Analyst]

Just a wild guess --- you didn't mean spatial calibration did you? Where your array (image) is misaligned and you want to shift it up, down, left, and/or right by 300 elements. If so, let me know.

By the way, you should respond as "Comments" rather than as a new independent "Answer" to your original question, unless your reply actually IS an answer to your original question.