How to use str2double without rounding
74 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi , I know this could be a possible duplicate but all those solutions stated there didn't work for me. I am using the str2double function and it always rounds the conversion to the 4 places after the decimal point. Do you guys have any idea on converting the whole string exactly the way it is without rounding ??
1 commentaire
Réponse acceptée
Nut
le 20 Jan 2017
Hi,
maybe you need a proper set of the output display format:
https://it.mathworks.com/help/matlab/ref/format.html
The default format is "short", with the "long" format you can see more digits, look at the following example.
A = '0.219033048405430510873439814';
>> A
A =
0.219033048405430510873439814
>> str2double(A)
ans =
0.2190
>> format long
>> str2double(A)
ans =
0.219033048405431
0 commentaires
Plus de réponses (1)
Stephen23
le 20 Jan 2017
Modifié(e) : Stephen23
le 20 Jan 2017
str2double does not do any rounding: does its documentation mention "rounding" anywhere? In fact you are just getting confused by how numbers as displayed in MATLAB. How number values are displayed is a totally different thing to how they are stored in memory. str2double reads all of those digits correctly.
>> format shortg
>> str2double('0.1234567890123456789')
ans = 0.12346
>> format longg
>> str2double('0.1234567890123456789')
ans = 0.123456789012346
There are plenty of format options: read the documentation and try some. Note that the double type is limited as to how many digits of precision it can handle. This is also not str2double's fault.
0 commentaires
Voir également
Catégories
En savoir plus sur Data Type Conversion dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!