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converts, formats, and writes data to a file


mfprintf(fd, format, a1, ..., an)



scalar positive index identifying the file, as provided by mopen.

If fd equals 0: redirection to stderr.

If fd equals 6: redirection to stdout (console).


a string providing the format to use to write all next arguments. The format follows -- as close as possible -- the C printf format operand syntax, as described in the printf_conversion page. UTF-8 extended characters are supported.

Numbered placeholders "%n$.." are not supported.

a1, ..., an

Data to be converted and written according to the format argument. Supported types: all numbers, booleans, strings. Only the real part of complex numbers is considered (current Scilab limitation).


mfprintf(fd, format, a1, a2, ..) replaces placeholders provided in the format string with values of a1, a2, .. converted according to each respective placeholder directive, and writes the result to the file specified by its index fd.

If a1, a2, .. are arrays with multiple rows, they feed the format row by row: the format is used iteratively for every row of the (horizontally "concatenated") arrays, until the bottom of the least tall array is reached. Remaining rows of taller arrays (if any) are ignored. See examples.

If the total number of columns of a1, a2, .. is bigger than the number of placeholders in the format, then extra columns are ignored. If it is smaller, an error is yielded.

The mfprintf function is a interface for C-coded fprintf function.


fd = mopen(TMPDIR+'/text.txt','wt');
mfprintf(fd,'hello %s %d.\n','world',1);
mfprintf(fd,'hello %s %d.\n','scilab',2);
mfprintf(fd,'This line is built with a column vector (26:28) %d.\n',[26:28].');
mfprintf(fd,'This line is built with a row vector (26:28) %d.\n',[26:28]);
A = rand(3,6);
mfprintf(fd,'This line is built with a matrix %.3f.\n',A);

mfprintf(0,'stderr output.\n');
mfprintf(6,'stdout output.\n');

I = (1:4)';
A = [26.93 ; 63.25 ; 40.51 ; 91.84];
B = [ 3.62 ; 15.04 ; 25.3  ; 48.19];
C = [ 4.37   28.06
     48.18   %inf
     41.48   %nan
     26.39   77.83];
Status = ["NOK" "NOK" "NOK" "OK"]';
Format = "Iteration %d: Results: A= %f   B= %2d%%  Status= %3s   C(1)= %g  C(2)= %e\n";
File = TMPDIR + "/mfprintf.txt";
fd = mopen(File, 'wt');
mfprintf(fd, Format, I, A, B, Status, C);
Iteration 1: Results: A= 26.930000   B=  3%  Status= NOK   C(1)= 4.37  C(2)= 2.806000e+01
Iteration 2: Results: A= 63.250000   B= 15%  Status= NOK   C(1)= 48.18  C(2)= Inf
Iteration 3: Results: A= 40.510000   B= 25%  Status= NOK   C(1)= 41.48  C(2)= Nan
Iteration 4: Results: A= 91.840000   B= 48%  Status=  OK   C(1)= 26.39  C(2)= 7.783000e+01

Supernumerary columns or rows are ignored:

A = [%T  %F  %T  %T  %F]';
B = [ 4.37   28.06
     48.18   %inf
     41.48   %nan ];
File = TMPDIR + "/mfprintf.txt";
fd = mopen(File, 'wt');
mfprintf(fd, "OK? %s  Value: %4.1f\n", A, B)
OK? T  Value:  4.4
OK? F  Value: 48.2
OK? T  Value: 41.5

See also

  • printf_conversion — mprintf, msprintf, mfprintf 変換仕様
  • csvWrite — CSVファイルを書き込む
  • fprintfMat — 行列をファイルに書き込む
  • write — フォーマットされたファイルに書き込む
  • mputl — テキストファイルに文字列を書き込む
  • mputstr — write a single text in an open file
  • mopen — ファイルをオープン
  • mclose — オープンされているファイルを閉じる
  • msprintf — 変換, 整形し, Scilab主ウインドウにデータを書き込む
  • mfscanf — 標準入力から入力を読み込む (C言語の scanf 関数へのインターフェイス)


6.1.1 Input data can be boolean.
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Last updated:
Tue Mar 07 09:28:49 CET 2023