Variable precision point for fprintf command set by user input
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I am trying to create a variable precision point through an user input to control how many decimal places are shown when displaying the results from the elements of a matrix.
This code is what I current have but would like to make the precision (currently at 10) adjustable:
when I try to replace the .10 with * and set a variable it messes up my code:
I am new to Matlab and would appreciate any help on this so I can input a values to dispaly results to any decimal place value.
回答（2 个）
"When you specify * as the field precision operator, the other input arguments must provide both a precision and a value to be printed. Precisions and values can be pairs of arguments, or pairs within a numeric array."
So the precisions and values must be in pairs. Example:
M = [1 2 3 4; 5 6 7 8];
precision = 10;
[nrows,ncols] = size(M);
args = zeros(1,2*ncols); % row vector of precision/value pairs
args(1:2:end) = precision; % 1st, 3rd, 5th, etc., elements are the precisions
for ii = 1:nrows
args(2:2:end) = M(ii,:); % 2nd, 4th, 6th, etc., elements are the values from M
fprintf(" %10.*f",args)
fprintf("\n")
end
Walter Roberson
2024-2-2
fprintf( fprintf(' %%10.%df'), precision), Ab(i,:))
4 个评论
Nathan
2024-2-2
I tried this code and keep getting alarm messages. I had to remove the parenthesis after %%10.%df') so it wouldn't alarm out at the start. I tried changing between %%10.%df', %%10.%ff', and %%10.*ff' and nothing is working.
Walter Roberson
2024-2-2
fprintf( sprintf(' %%10.%df', precision), Ab(i,:))
Nathan
2024-2-2
Walter Roberson
2024-2-2
It is equivalent to
Format = sprintf(' %%10.%df', precision);
fprintf(Format, Ab(i,:));
The sprintf() computes the format to be used by the fprintf()
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2024-2-2
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