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Why does str2num truncate my number so early?

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Andrew Reibold
Andrew Reibold el 23 de Jun. de 2014
When I try to convert from string to number, I lose precision?
whos test_str
Name Size Bytes Class Attributes
test_str 1x9 18 char
K>> test_str
test_str =
0.067354
K>> str2num(test_str)
ans =
0.0674

Respuesta aceptada

José-Luis
José-Luis el 23 de Jun. de 2014
format long
str2num(test_str)
  2 comentarios
Andrew Reibold
Andrew Reibold el 23 de Jun. de 2014
Thank you Jose-Luis
This worked great. I presume that this changes the format for any future things I type as well?
Does anyone know what is the 'default' format if it is not long?
José-Luis
José-Luis el 23 de Jun. de 2014
You could read the documentation:
doc format
Note that this only changes how the number is displayed. Its internal representation is, by default in Matlab, a double.

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Más respuestas (1)

Sara
Sara el 23 de Jun. de 2014
Use
sprintf
so you can control the precision you want.
  3 comentarios
Sara
Sara el 23 de Jun. de 2014
I read it the other way around, sorry.
Jairo Andrés Gutiérrez Suárez
Jairo Andrés Gutiérrez Suárez el 7 de Feb. de 2022
Yep but that method is not efficient. There should be a way to use the exact number of decimals. What if I am using srt2num to find a folder with the same number I looked for?

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