matlabstr2num固定位宽,matlab num2str位数保留的⼩数点后
位数
Format of the output fields, specified using formatting
operators. formatSpec also can include ordinary
text and special characters.
formatSpec can be a character vector in
single quotes, or, starting in R2016b, a string scalar.
Formatting Operator
A formatting operator starts with a percent
sign, %, and ends with a
conversion character. The conversion character is required.
Optionally, you can specify identifier, flags, field width,
precision, and subtype operators
between % and the conversion character. (Spaces
are invalid between operators and are shown here only for
readability).
Conversion Character
This table shows conversion characters to format numeric and
character data as text.
Value Type
Conversion
Details
Integer, signed
%d or %i
Ba 10
Integer, unsigned
%u
Ba 10
%o
Ba 8 (octal)
%x
Ba 16 (hexadecimal), lowerca
letters a–f
%X
Same as %x, upperca
letters A–F
Floating-point number
%f
Fixed-point notation (U a precision operator to specify the
number of digits after the decimal point.)
%e
Exponential notation, such as 3.141593e+00 (U a precision operator
to specify the number of digits after the decimal point.)
%E
Same as %e, but upperca,
such as 3.141593E+00 (U a precision operator
to specify the number of digits after the decimal point.)
%g
The more compact of %e or %f, with no trailing zeros (U a precision operator to specify the number of significant digits.)
%G
The more compact of %E or %f, with no trailing zeros (U a precision operator to specify the number of significant digits.)
Characters or strings
%c
Single character
%s
Character vector or string array. The type of the output text is
the same as the type of formatSpec.
菌灵芝Optional Operators
The optional identifier, flags, field width, precision, and subtype
operators further define the format of the output text.
Identifier
Order for processing the function input arguments. U the
syntax n$, where n reprents the positions of the
other input arguments in the function call.
Example: ('%3$s %2$s %1$s
%2$s','A','B','C') prints input
arguments 'A', 'B', 'C' as
follows: C B A
B.
Note: If an input argument is an array, you
cannot u identifiers to specify particular array elements from that input argument.
Flags
'–'
Left-justify.
现代诗简短Example: %-5.2f
Example: %-10s
'+'
Always print a sign character (+ or –) for any numeric
value.
Example: %+5.2f
Right-justify text.
Example: %+10s
'
'
Inrt a space before the value.
Example: %
5.2f
'0'
Pad to field width with zeros before the value.
Example: .2f
'#'
Modify lected numeric conversions:
For %o, %x,
or %X,
print 0, 0x,
or 0X prefix.
For %f, %e,
or %E, print decimal point even when precision is 0.
For %g or %G, do not remove trailing zeros or decimal point. Example: %#5.0f
Field Width
Minimum number of characters to print. The field width operator can be a number, or an asterisk (*) to refer to an input argument. Example: The input
arguments ('d',intmax) are equivalent
to ('%*d',
12, intmax).
The function pads to field width with spaces before the value
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unless otherwi specified by flags.
Precision
For %f, %e,
or %E
Number of digits to the right of the decimal point
银行理财哪个银行收益最高Example: '%.4f' prints pi as '3.1416'
For %g or %G
Number of significant digits
Example: '%.4g' prints pi as ' 3.142'动力英语
The precision operator can be a number, or an asterisk
(*) to refer to an argument.
Example: The input
arguments ('%6.4f',
pi) are equivalent
to ('%*.*f', 6, 4, pi).
Note: If you specify a
precision operator for floating-point values that exceeds the precision of the input numeric data type, the results might not
match the input values to the precision you specified. The result depends on your computer hardware and operating system. Subtypes
You can u a subtype operator to print a floating-point value as
its octal, decimal, or hexadecimal value. The subtype operator immediately precedes the conversion character. This table shows the
conversions that can u subtypes.
Input Value Type
Subtype and Conversion Character
Output Value Type
亲情作文结尾Floating-point number
%bx or %bX
%bo
%bu
Double-precision hexadecimal, octal, or decimal value
Example: %bx prints pi as 400921fb54442d18
%tx or %tX
%to
%tu
Single-precision hexadecimal, octal, or decimal value
Example: %tx prints pi as 40490fdb
Text Before or After Formatting Operators
formatSpec can also include additional
text before a percent sign, %, or after a conversion character. The text can be: Ordinary text to print.
Special characters that you cannot enter as ordinary text. This
胡桃楸木table shows how to reprent special characters
in formatSpec.
Special Character
Reprentation
Single quotation mark
''
Percent character
%%大有起色
Backslash
\\
Alarm
\a
Backspace
\b
