Why does str2num truncate my number so early?

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

Answer 1

[José-Luis]

 format long
 str2num(test_str)

[Andrew Reibold]

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]

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.

Answer 2

[Sara]

Use

sprintf

so you can control the precision you want.

[Andrew Reibold]

Doesn't this return a string?

I am trying to convert a string to a number/double/float.

[Sara]

I read it the other way around, sorry.

[Jairo Andrés Gutiérrez Suárez]

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?