how to stop exponential notation, both in output and in variable editor
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tombola
il 7 Dic 2011
Commentato: Steven Lord
il 24 Ott 2023
Hi is there any way, preferably from code, to stop exponential notation.
So any figures I display, or look at in the variable editor, are always in the format 0.0000000234 etc never 2.34e-8
Thanks for any help,
Tom
3 Commenti
Walter Roberson
il 6 Giu 2018
No; if you have a need like that you should probably fprintf() the data
Walter Roberson
il 17 Dic 2019
Brando:
You could write a disp_no_scientific function that queried the existing format setting, and activated g format, and then returned to the previous format. However, as noted by Titus, format g does use scientific notation for sufficiently large or small values. There is no format setting for fixed point. If you need that then you should be using fprintf() or perhaps num2str() with an appropriate % format.
Risposta accettata
Walter Roberson
il 7 Dic 2011
Modificato: John Kelly
il 4 Giu 2014
For variables that you disp(), command
format long
or
format long g
For the variable editor, see these instructions: http://www.mathworks.com/help/matlab/matlab_prog/check-variable-scope-in-editor.html
5 Commenti
Sam H
il 14 Mar 2018
yes, you can use 'fprintf'
a=0.0001234;
fprintf('%.7f\n',a)
Walter Roberson
il 17 Dic 2019
Brando:
You could write a disp_no_scientific function that queried the existing format setting, and activated g format, and then returned to the previous format. However, as noted by Titus, format g does use scientific notation for sufficiently large or small values. There is no format setting for fixed point. If you need that then you should be using fprintf() or perhaps num2str() with an appropriate % format.
Più risposte (3)
Titus Edelhofer
il 7 Dic 2011
Hi Tom,
as far as I know there is no way to force MATLAB to always use fixed notion. For generating output you can use fprintf with %f to use fixed notion.
Titus
2 Commenti
SOREL
il 6 Giu 2018
Modificato: Walter Roberson
il 6 Giu 2018
Hi with the live editor I got a resul printed like this
A = 1.6050541506550198034773572941784e-40*d2
since 1.6e-40 is 0 is it possible to force the the A variable to be 0
4 Commenti
Walter Roberson
il 17 Dic 2019
Note: there are additional new and quite obscure possibilities since R2019a. They are difficult to locate; if you do not already know they exist you are unlikely to find reference to them, and even if you know the exist you need a fair bit of experience with symbolic toolbox programming to make use of them :(
Steven Lord
il 24 Ott 2023
FYI if you're doing numerical calculations involving trigonometric functions multiples of pi and want to avoid the round-off error caused by the pi function not returning the exact transcendental value of π, use the sinpi or cospi functions instead.
y = cos(pi/2)
z = cospi(1/2)
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