str2num returning value while the preferred str2double returning NaN...

3 visualizaciones (últimos 30 días)
New to MATLAB, so maybe this is a stupid question. I have the following script in MATLAB to run a python script and return a value (3.4763, for eg). When I use str2num like below, I get a the value in p. However, MATLAB suggests to use str2double. When I do that, I get NaN instead of the value. Please help...
w = 16;
systemCommand = ['python fun.py ',num2str(w)];
[stat, res] = system(systemCommand);
p = str2num(res);
What python returns from execution is '[3.4763]' in the variable res.

Respuesta aceptada

Rik
Rik el 1 de Abr. de 2021
This is another difference:
str2double('evalc(''exit'')')
ans = NaN
str2num('evalc(''exit'')')
%will exit Matlab
You should parse the result to single values. In your case simply removing the brackets will do, but this should be more robust:
str='[3.14159 1.00e-001]';
str2double(regexp(str,'[.0-9eE\-]*','match'))
ans = 1×2
3.1416 0.1000

Más respuestas (0)

Categorías

Más información sobre Call Python from MATLAB en Help Center y File Exchange.

Productos


Versión

R2020b

Community Treasure Hunt

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

Start Hunting!

Translated by