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From: John D'Errico on 26 May 2010 19:34
"Oscar " <Ozkitar(a)gmail.com> wrote in message <htk99e$6ve$1(a)fred.mathworks.com>...
> Hello.
>
> I have a character matrix like this:
> matrix =
>
> a 1 v1 v3 c2 c1 a 4 a 2 a 5 a 6
> a 2 v3 v2 c5 c1 a 1 a 3 a10 a 5
> a 3 v2 v4 c4 c1 a 2 a 4 a 8 a10
> a 4 v4 v1 c3 c1 a 3 a 1 a 6 a 8
> a 5 v5 v3 c5 c2 a 7 a 1 a 2 a12
> a 6 v1 v6 c3 c2 a 1 a 7 a 9 a 4
> a 7 v6 v5 c6 c2 a 6 a 5 a12 a 9
> a 8 v4 v7 c4 c3 a 4 a 9 a11 a 3
> a 9 v7 v6 c6 c3 a 8 a 6 a 7 a11
> a10 v2 v8 c5 c4 a 3 a11 a12 a 2
> a11 v8 v7 c6 c4 a10 a 8 a 9 a12
> a12 v5 v8 c6 c5 a 5 a10 a11 a 7
>
> As you see, some elements of the "first column" (actually will be the three first columns because "matrix" is a 12x47 char) and other "columns" (6 to 10) have a space between 'a' and 'number' where number can be 1, 2, 3, 4, etc...
> Does anyone know any function to delete certain characters located in a matrix?
>
> If there's no mechanism to do this, i would think in redifining the matrix...
>
> Now, my matrix has been defined following this procedure:
>
> n_ARISTASf=[1:1:12]';
> ARISTASf_str=strcat('a',[1:1:12]');
> %I should have that ARISTASf_str=[a1;a2....a9,a10] but i actually have
> %[a 1;a 2....a 9,a10] -> the existence of numbers with two digits creates
> %a non-desirable space in some of the componentes of the vector
>
> %..... Following variables inside num2str() are double column vectors
> IZQf_str=strcat('c',num2str(izq_prima));
> DERf_str=strcat('c',num2str(der_prima));
> DESf_str=strcat('v',num2str(DESDf));
> HACIAf_str=strcat('v',num2str(HACIAf));
> pder_prima_str=strcat('a',num2str(pder_prima));
> sder_prima_str=strcat('a',num2str(sder_prima));
> pizq_prima_str=strcat('a',num2str(pizq_prima));
> sizq_prima_str=strcat('a',num2str(sizq_prima));
>
> blanks=[];
> for i=1:size(ARISTASf_str,1)
> huecos=vertcat(blanks,' ');
> end
> matrix=horzcat(ARISTASf_str,blanks,DESf_str,blanks,HACIAf_str,blanks,IZQf_str,blanks,DERf_str,blanks,pder_prima_str,blanks,sder_prima_str,blanks,pizq_prima_str,blanks,sizq_prima_str);
>
> That is to say, i do a horzcat of column vectors, that i've obtained using strcat('letter',num2str(vector of doubles)).
>
> In conclusion, i want to remove the blank spaces that appear after certain 'a' characters.

Convert to a cell array strings, with each row
a cell.

Then use regexp to find and delete spaces that are
preceded by a character.

Apply this to every cell using cellfun.

John
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