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# converting specific string variables to double

Asked by antonet on 15 Jun 2013

Dear all,

I have the following matrix

``` A={'name'
'afsaf'
'sfsfs'
'0'
'rpytui'
'0'
'0'
'0'
'dfgl'
'trd'
};```

I want to convert the zeros which are string variables to numeric variables; that is

``` A={'name'
'afsaf'
'sfsfs'
[0]
'rpytui'
[0]
[0]
[0]
'dfgl'
'trd'
};```

Is there a way of doing that?

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Answer by the cyclist on 15 Jun 2013

I knew there was an easier way:

```A(ismember(A,'0'))={0}
```

## 1 Comment

Azzi Abdelmalek on 15 Jun 2013

This one is much faster

Answer by Jan Simon on 17 Jun 2013
Edited by Jan Simon on 17 Jun 2013
```A(strcmp(A, '0')) = {0}
```

## 1 Comment

Azzi Abdelmalek on 17 Jun 2013

This is faster

```A=repmat(A,100000,1);
tic
A(ismember(A,'0'))={0};
toc
tic
A(strcmp(A, '0')) = {0};
toc
```
```Elapsed time is 0.047910 seconds.
Elapsed time is 0.012593 seconds.
```
Answer by the cyclist on 15 Jun 2013

I am quite sure there is a simpler way, but one way is

```A(cellfun(@(x)isequal(x,'0'),A))={0};
```

```A(~cellfun('isempty',strfind(A,'0')))={0}