Trey Torno February 2016
### Filter on parts of words in Matlab tables

Similar to Excel, I need to find out how to filter out rows of a table that do not contain a certain string.

For example, I need only rows that contain the letters "MX". Within the sheet, there are rows with strings like ZMX01, MX002, and US001. I would want the first two rows.

This seems like a simple question, so I am surprised I couldn't find any help for this!

It is similar to the question Filter on words in Matlab tables (as in Excel)

You may not find a lot of information on tables in MATLAB, as they were introduced with version R2013a, which is not *that* long ago. So, about your question: Let's first create a sample table:

```
% Create a sample table
col1 = {'ZMX01'; 'MX002'; 'US001'};
col2 = {5;7;3};
T = table(col1, col2);
T =
col1 col2
_______ ____
'ZMX01' [5]
'MX002' [7]
'US001' [3]
```

Now, MATLAB provides the `rowfun`

function to apply any function to each row in a table. By default, the function you call has to be able to work on *all* columns of the table.
To only apply `rowfun`

to one column, you can use the `'InputVariables'`

parameter, which lets you specify either the number of the column (e.g. `2`

for the second column) or the name of the column (e.g. `'myColumnName'`

).
Then, you can set `'OutputFormat'`

to `'uniform'`

to get an array and not a new table as output.

In your case, you'll want to use `strfind`

on the column `'col1'`

. The return value of `strfind`

is either an empty array (if `'MX'`

wasn't found), or an array of all indices where `'MX'`

was found.

```
% Apply rowfun
idx = rowfun(@(x)strfind(x,'MX'), T, 'InputVariables', 'col1', 'OutputFormat', 'uniform');
```

The output of this will be

```
idx =
[2]
[1]
[]
```

i.e. a *3-by-1* cell array, which is empty for `'US001'`

and contains a positive value for both other inputs. To create a subset of the table with this data, we can do the following:

```
% Create logical array, which is true for all rows to keep.
idx = ~cellfun(@isempty, idx);
% Save these row
```

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```#### Post Status

Asked in February 2016

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