printf

printf prints formatted data into the command window.

rsNChars = printf(ssFormat, arg1, ...)

Return Value

rsNChars is the number of output characters or -1 if an error occurred.

Parameters

ssFormat

ssFormat is a scalar string with embedded format specifications. A format specification has the following form:

%{flags}[width][.precision][m|l|L]type

%

The format specification begins with a percent sign (%). To print a percent sign %% must be written.

flags

A flag is one of the following characters:

Value	Meaning
-	causes the output to be left justified.
+	Prefix the output value with a sign (+ or -)
#	When used with the o, x, or X format, the # flag prefixes any nonzero output value with 0, 0x, or 0X, respectively. When used with the e, E, or f format, the # flag forces the output value to contain a decimal point in all cases. When used with the g or G format, the # flag forces the output value to contain a decimal point in all cases and prevents the truncation of trailing zeros.
(blank) ” “	Prefix the positiv output value with a blank
0	If width is prefixed with 0, zeros are added until the minimum width is reached. If 0 and ? appear, the 0 is ignored. If 0 is specified with an integer format (i, u, x, X, o, d) and a precision specification is also present (for example, %04.d), the 0 is ignored.

width

width Optional number that specifies minimum number of characters output.

.precision

precision Optional number that specifies maximum number of characters printed for all or part of the output field, or minimum number of digits printed for integer values.

m

causes the output to be done row by row for matrices and column vectors.

l,L

The characters "l" and "L" are ignored.

type

The type character is the only required format field:

Value	Meaning
f	Real value having the form [-]dddd.dddd, where dddd is one or more decimal digits.
e, E	The argument is a real value having the form [-]d.dddd e [sign]ddd, where d is a single decimal digit, dddd is one or more decimal digits, ddd is exactly three decimal digits, and sign is + or -.
g, G	The argument is real. The output works in “e” or “E” format when the exponent of the argulment is smaller than 3 or larger than the precision is. Otherwise the output follows in “f” format.
i, d, u	The argument is real. It will be converted to an integer.
x, X, p	The argument is real. It will be converted to a hexamdecimal number.
o	The argument is real. It will be converted an octal number.
c	The argument is real. It will be converted to an ASCII character.
s	The argument is a string.

Example

* a = rand(1,5) * 100
* printf("%10d\n%10.2f\n%10.2e\n%10.2g\n", a, a, a, a)
    86         8        43        84        98
     86.18      8.30     43.97     84.32     98.93
  8.62e+01  8.30e+00  4.40e+01  8.43e+01  9.89e+01
    86       8.3        44        84        99
  204.0000
* printf("This is a string")
This is a string    15.0000

See also

fprintf, sprintf, ltostr

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