Error using fprintf for cells

Question

siddhesh rane 2013-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/83139-error-using-fprintf-for-cells

I am using following code to generate text file from array which has 1 matrix of 496 * 6 size with strings in it. I m getting 'Bad cell reference operation.' error

Code:

   fileID = fopen('Gcode.txt','w');
   fprintf(fileID,'%10s %10s %10s %10s %10s %10s \n', G_code{1,1}{:}, G_code{1,1}      {:},G_code{1,1}{:},G_code{1,1}{:},G_code{1,1}{:},G_code{1,1}{:});
   fclose(fileID);

Can anyone explain?

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Answer 1

Cedric 2013-7-25

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编辑：Cedric 2013-7-25

在 MATLAB Online 中打开

G_code{1,1}{:} is a comma separated list (CSL), which is not - I guess - what you thought it was. It is not possible to tell you what is wrong without knowing what you store in G_code and how you want it written in the file, but to illustrate, if G_code{1,1} where the cell array {'hello', 'world'}, the following line

fprintf('%s %s\n', G_code{1,1}{:}) ;

would be equivalent to

fprintf('%s %s\n', G_code{1,1}{1}, G_code{1,1}{2}) ;

or taking the content

fprintf('%s %s\n', 'hello', 'world') ;

So you see that {:} returns a list of cells' content separated by commas.

EDIT: as FPRINTF repeats its formatSpec until all its args are displayed, you can use CSL the following way: assume you want to have two columns in the output with the data

>> data = {'A1', 'A2'; 'B1', 'B2'} ;

you can specify a formatSpec with two column, and develop data as a CSL (but just once)

 >> fprintf('%s %s\n', data{:}) ;
 A1 B1
 A2 B2

which is equivalent to

 >> data_col = data(:) ;
 >> fprintf('%s %s\n', data_col{1}, data_col{2}, data_col{3}, data_col{4}) ;

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siddhesh rane 2013-7-25

its showing error:

Cell contents reference from a non-cell array object.

Error in readSTLexp13 (line 599)

fprintf('%10s %10s %10s %10s %10s %10s \n', buffer{:}) ;

Cedric 2013-7-25

How did you define buffer? based on your initial code, I was assuming that G_code is a cell array, and that cell (1,1)'s content is again a cell array with the strings. However, I suspect that you made a mistake in the way you are addressing G_code's content .. how is it defined?

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