Display number with engineering notation

172 Ansichten (letzte 30 Tage)
Jared
Jared am 8 Nov. 2011
Bearbeitet: Harry Dymond am 31 Mai 2020
I'm trying to display a number I read in with textscan in engineering notation. I was trying to switch the format to short eng and do:
evalc('disp(x)')
But it doesn't matter what format I set, the format textscan reads it in is what it uses.
  1 Kommentar
Harry Dymond
Harry Dymond am 31 Mai 2020
Bearbeitet: Harry Dymond am 31 Mai 2020
For the benifit of those stumbling across this old thread in search of answers: please see my answer below

Melden Sie sich an, um zu kommentieren.

Akzeptierte Antwort

Walter Roberson
Walter Roberson am 8 Nov. 2011
My tests disagree with Jared's findings:
>> result = textscan('133423.3e7','%f')
result =
[1334233000000]
>> format short eng
>> evalc('disp(result{1})')
ans =
1.3342e+012
>> result{1}
ans =
1.3342e+012
Engineering format was indeed used for the output, and the output is not the same as the format of the value that was read in nor of the format the data was stored in
  2 Kommentare
Jared
Jared am 9 Nov. 2011
During more experimentation, it works for an example like the one you posted. However, and I guess I forgot to put it in my original question, I am actually trying to set the string in a GUI using
set(handles.example,'String','example string'). For some reason, it does not seem to follow these formatting inputs.
Walter Roberson
Walter Roberson am 9 Nov. 2011
Trying to set as input or as output? Are you using
textscan( get(handles.example,'String'), 'Some Format Here')
or are you using
set(handles.example, 'String', x) %where x is the numeric value
or are you using something like:
set(handles.example, 'String', evalc('format short eng; disp(x)'))
If you are trying to set the String parameter to a numeric value, then the conversion that MATLAB uses is not documented (as best I recall.)

Melden Sie sich an, um zu kommentieren.

Weitere Antworten (2)

Harry Dymond
Harry Dymond am 31 Mai 2020
For the benifit of those stumbling across this old thread in search of answers: my FEX submission num2eng will do this, and offers SI prefixes as well as engineering notation.

owr
owr am 8 Nov. 2011
Try sprintf with a format string. It converts the number to a text string with a format of your choosing. Some built in MATLAB functions use this trick, for example, edit the code for dlmread.
  1 Kommentar
Jared
Jared am 8 Nov. 2011
As far as I know, sprintf does not have a engineering notation format string.

Melden Sie sich an, um zu kommentieren.

Kategorien

Mehr zu Data Type Conversion finden Sie in Help Center und File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by