How to replace some values in a matrix?

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aditya sahu
aditya sahu on 1 May 2017
Commented: Image Analyst on 1 May 2017
I have x=16 * 16 matrix of double values. i need to figure out consecutive values of 'x' which are less than 150 and replace them with the original value plus(+) 8.

Accepted Answer

Stephen
Stephen on 1 May 2017
Edited: Stephen on 1 May 2017
Just use a logical index:
>> x = randi(200,16,16);
>> idx = x<150;
>> x(idx) = x(idx)+8;
Very basic MATLAB operations, such as logical indices, as introduced in the Getting Started tutorials, which are highly recommended for all beginners:
  3 Comments
Image Analyst
Image Analyst on 1 May 2017
How are you defining consecutive? MATLAB goes row by row (down rows), then over to the next column and down its rows. Is that your definition? If so, then is the last element in column 2 consecutive with the first element in column 3?

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