Spacing strings using strcat and fprintf

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Seb
Seb 2015-11-21
评论： Seb 2015-11-21
I am attempting to create an output text file that uses a combination of character arrays, standard arrays, and cell arrays. The only suggestion I've been given is to use a combination of strcat to concatenate the string and then use fprintf to put into a text file. I am having trouble formatting the document to my liking and am very new to Matlab. If I did something similar to the example below, how would I use fprintf to format C such that I had desired spacing for all of the elements? :
A=[0.56,0.88];
B='BS';
C=strcat(B,num2str(A(1,1)),num2str(A(1,2)))
  2 个评论
Walter Roberson
Walter Roberson 2015-11-21
What spacing do you desire? And how many decimal points do you want output for the numbers? If a value was (for example) 0.0005182 and you wanted 2 decimal places, then would you want 0.00 as the output or would you want 0.00052 as the output or 0.52E-4 ?
Seb
Seb 2015-11-21
In general, I'm just looking for a procedure. My actual data requires scientific notation, and will involve 10 pieces of data to be concatenation.

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Walter Roberson
Walter Roberson 2015-11-21
You can use techniques similar to what I showed in this post. Construct a cell array, and any column of it that is not going to be pure numeric, convert the numerics to strings, slam everything together with an fprintf() that has %s for any column that is not pure numeric, and appropriate %d or %e or %f or %g format for any column that is pure numeric.
You can use %15s (or as appropriate for the number) to enforce that (at least) 15 characters will be printed for a string -- this allows you to control the width of the column and helps line up decimal places. Numeric formats can take widths as well.

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