# Replacing a value with nan

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Elaheh on 18 Apr 2018
Answered: Dennis on 18 Apr 2018
Hello all. I want to replace a value that I have in accuracyC with nan if its counterpart value is nan in RTc. RTc and accuracyC are two matrices. I have written this loop but it does not work. I appreciate your help.
h=0;
for i=1:size(accuracyC,1)
for j=1:size(accuracyC,2)
if RTc(i,j)==nan
accuracyC(i,j)=NaN;
h=h+1;
end
end
end

Star Strider on 18 Apr 2018

Try this:

```RTc = [1 2 3 NaN; 4 5 6 7; NaN 8 9 10]                      % Create Matrix
AccuracyC = randi(9, size(RTc))                             % Create Matrix
```
```AccuracyC(isnan(RTc)) = NaN                                 % Desired Result
```
```RTc =
```
```       1     2     3   NaN
4     5     6     7
NaN     8     9    10```
```AccuracyC =
```
```       7     1     6     6
8     3     9     3
1     8     2     1```
```AccuracyC =
```
```       7     1     6   NaN
8     3     9     3
NaN     8     2     1```

### More Answers (1)

Dennis on 18 Apr 2018

But you can use isnan instead.

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