Format number in the same format as disp

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I want to format number to the string with the same format as used by disp to output numbers. So I want to write function my_format that would take number and output same string as disp. I don't need new lines, just correctly formatted number. For example
>> format
>> pi
ans =
3.1416
>> my_format(pi)
ans =
'3.1416'
>> format long
>> pi
ans =
3.141592653589793
>> my_format(pi)
ans =
'3.141592653589793'
  7 个评论
Walter Roberson
Walter Roberson 2019-9-23
I should have specified "under format long g as that is the format we were talking about.

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采纳的回答

Walter Roberson
Walter Roberson 2019-9-23
matlab.internal.display.containedDisplay(value,width)
formats value according to the current format, provided that the formatted result would be that width or less. If the formatted result would be longer, it returns the empty string ""
There is a lower-level routine matlab.internal.display.containedDisplayHelper that can also accept the format specification to use such as 'longG'; it needs its input packaged a particular way though.
As of R2019b, the internal display routines appear to be:
matlab.internal.display.commandWindowWidth
matlab.internal.display.containedDisplay
matlab.internal.display.containedDisplayHelper
matlab.internal.display.dimensionString
matlab.internal.display.format
matlab.internal.display.formatSpacing
matlab.internal.display.getCellDisplayOutput
matlab.internal.display.getContainedClassName
matlab.internal.display.getDimensionSpecifier
matlab.internal.display.getHeader
matlab.internal.display.getNewlineCharacter
matlab.internal.display.getObjectHeaderHelper
matlab.internal.display.isDesktopInUse
matlab.internal.display.isHot
matlab.internal.display.language
matlab.internal.display.numericDisplay
matlab.internal.display.numericDisplayHelper
matlab.internal.display.printWrapped
matlab.internal.display.truncateLine
matlab.internal.display.wrappedLength
Some of those have .m source in toolbox/matlab/lang/+matlab/+internal/+display but most are built-in.
  1 个评论
Anton Gribovskiy
Anton Gribovskiy 2019-9-24
Thank you. containedDisplay if exactly what I was looking for.

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更多回答(1 个)

Bruno Luong
Bruno Luong 2019-9-22
>> x=logspace(1,3,10)
x =
1.0e+03 *
0.0100 0.0167 0.0278 0.0464 0.0774 0.1292 0.2154 0.3594 0.5995 1.0000
>> disp(x) % same as above
1.0e+03 *
0.0100 0.0167 0.0278 0.0464 0.0774 0.1292 0.2154 0.3594 0.5995 1.0000
>> str=evalc('disp(x)');
>> fprintf('\nx =\n\n%s', str)
x =
1.0e+03 *
0.0100 0.0167 0.0278 0.0464 0.0774 0.1292 0.2154 0.3594 0.5995 1.0000
  1 个评论
Anton Gribovskiy
Anton Gribovskiy 2019-9-22
Thank you. Works like a charm wrapped in strip. I understand that eval is considered to be evil, but I think that could work as a part of private method of a class.

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