How to call a command prompt variable when executing operating system command from Matlab
5 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Samuel de Vries
le 25 Sep 2017
Réponse apportée : Samuel de Vries
le 18 Déc 2017
Dear all,
I am trying to call a command prompt variable from within a operating system command using Matlab. An example of what I want to run using the command prompt:
set expr=$1=179*($1*0.265+$2*0.670+$3*0.065) & echo %expr%
Gets me the output I would like:
$1=179*($1*0.265+$2*0.670+$3*0.065)
When I try to run this from Matlab, using the following script:
cmd = 'set expr=$1=179*($1*0.265+$2*0.670+$3*0.065) & echo %expr%'
[status,cmdout] = system(cmd)
I get the following output:
cmdout =
'%expr%
'
Which suggests that matlab surrounds the %expr% in quotations before it sends the command to the command prompt.
The reason I am trying to do all this is because I want to use the string in expr as an input argument of a Radiance program which was written for Unix. The only way which I found I could do this on a Windows system is by first defining a variable containing the expression as a string and then calling this string from within the Radiance command argument.
I hope someone could shed some light on how I could solve this.
Kind regards,
Samuel
3 commentaires
Looky
le 25 Sep 2017
Modifié(e) : Looky
le 25 Sep 2017
Answering your main question. The reason that your code isn't working is that your set command executes, but the echo command doesn't see the new variable yet. This happens when commands are seperated by & and the time between setting and using the new variable is not long enough. You can get around this by using the cmd with the /V parameter like this (Windows only):
cmd='cmd /V:ON /c "set expr=179*($1*0.265+$2*0.670+$3*0.065) & echo %expr%"';
[status,cmdout] = system(cmd);
or use the setenv function of matlab to seperate setting and echoing of the variable.
Réponse acceptée
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Logical dans Help Center et File Exchange
Produits
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!