Write text and numbers using fprintf

clear all; na = ['a' 'b' 'c']'

 cor = [1.67 2.34 3.55]'

cor2 = num2str(cor)

mat = [na cor2]

   fileID = fopen('mattest.txt','w');

 fprintf(fileID,'%4c %4c \r\n',mat(:,1:2).');

 fclose(fileID);
%

Hello all,

From the above script, I would like a textfile

a 1.67

b 2.34

c 3.55

However, cor2 has four columns, so what I get is simply

a 1

b 2

c 3

how can I collapse cor2 into a [3,1] matrix?

Best, J

[Jan]

"Collapse cor2 into a [3,1] matrix"? You convert 1.67 to a char, so what do you expect? What does "cor2 has four columns" mean?

Answer 1

[Jan]

na = ['a' 'b' 'c']';     % Now this is a [3 x 1] matrix already
cor = [1.67 2.34 3.55]'  % This is a [3 x 1] matrix also
% cor2 = num2str(cor)    % Bad idea
% mat = [na cor2]        % Wrong idea, they have different types.  

fileID = fopen('mattest.txt','w');
for k = 1:numel(na)
  fprintf(fileID, '%4c %4f\r\n', na(k), cor(k));
end
fclose(fileID);

Or work with a cell array:

c      = cat(2, num2cell(na), num2cell(cor)).';
fileID = fopen('mattest.txt','w');
fprintf(fileID, '%4c %4f\r\n', c{:});
fclose(fileID);

Perhaps you do not want the numerical format %4f, then look in the docs of:

doc fprintf