MATLAB Central Newsreader - Adding Text columns to a Matrix

Adding Text columns to a Matrix

Raju Gain — Wed, 17 Sep 2008 18:41:03 -0400

Hello,

I have created a variable A = zeros(5,5). The first three columns contain double values. I have another variable which contains strings for example 'Yes' or 'No'. I am trying to add this variable to A(:,4) (to make it as the fourth column) but I keep getting an error which says " The following error occurred converting from cell to double:
Error using ==> double
Conversion to double from cell is not possible."

I am not sure what I am doing wrong. It should be quite straight forward. Can someone help?

Thanks

Re: Adding Text columns to a Matrix

Barry Williams — Wed, 17 Sep 2008 18:55:04 -0400

"Raju Gain" <supernova5271@yahoo.com> wrote in message <garivv$sni$1@fred.mathworks.com>...
> Hello,
>
> I have created a variable A = zeros(5,5). The first three columns contain double values. I have another variable which contains strings for example 'Yes' or 'No'. I am trying to add this variable to A(:,4) (to make it as the fourth column) but I keep getting an error which says " The following error occurred converting from cell to double:
> Error using ==> double
> Conversion to double from cell is not possible."
>
> I am not sure what I am doing wrong. It should be quite straight forward. Can someone help?
>
> Thanks

Search the documentation for information on creating a cell array. This will hold both numerical and text data.
Barry

Re: Adding Text columns to a Matrix

someone — Wed, 17 Sep 2008 19:01:03 -0400

"Raju Gain" <supernova5271@yahoo.com> wrote in message <garivv$sni$1@fred.mathworks.com>...
> Hello,
>
> I have created a variable A = zeros(5,5). The first three columns contain double values. I have another variable which contains strings for example 'Yes' or 'No'. I am trying to add this variable to A(:,4) (to make it as the fourth column) but I keep getting an error which says " The following error occurred converting from cell to double:
> Error using ==> double
> Conversion to double from cell is not possible."
>
> I am not sure what I am doing wrong. It should be quite straight forward. Can someone help?
>
> Thanks

% This should get you started:

A = zeros(5,5)
B = num2cell(A)

B{4,1} = 'yes'
B{1,4} = 'no'

% etc.

Re: Adding Text columns to a Matrix

Walter Roberson — Wed, 17 Sep 2008 19:05:06 -0400

"Raju Gain" <supernova5271@yahoo.com> wrote in message <garivv$sni$1@fred.mathworks.com>...

> I have created a variable A = zeros(5,5). The first three
> columns contain double values. I have another variable
> which contains strings for example 'Yes' or 'No'. I am
> trying to add this variable to A(:,4)

You cannot mix data classes in a single array. You cannot
have text in a numeric array.

The closest you can get is the approach the other poster
suggested, which is to use a cell array -- or you could
use a structure which had a field for the numerics and
another field for the text. But neither cell arrays
nor structures will display "nicely" as columns of numbers
intermixed with columns of text.

Re: Adding Text columns to a Matrix

Raju Gain — Wed, 17 Sep 2008 23:34:02 -0400

Thanks everyone..
Got it working..

"Walter Roberson" <roberson@ibd.nrc-cnrc.gc.ca> wrote in message <garkd2$ifv$1@fred.mathworks.com>...
> "Raju Gain" <supernova5271@yahoo.com> wrote in message <garivv$sni$1@fred.mathworks.com>...
>
> > I have created a variable A = zeros(5,5). The first three
> > columns contain double values. I have another variable
> > which contains strings for example 'Yes' or 'No'. I am
> > trying to add this variable to A(:,4)
>
> You cannot mix data classes in a single array. You cannot
> have text in a numeric array.
>
> The closest you can get is the approach the other poster
> suggested, which is to use a cell array -- or you could
> use a structure which had a field for the numerics and
> another field for the text. But neither cell arrays
> nor structures will display "nicely" as columns of numbers
> intermixed with columns of text.