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Ehsan, here is a small m-file example, which change a value in the dck-file (shift2), saves the dck-file and finally run TRNSYS. % m file, which calls TRNSYS % %Test for open an external file and write a value to the file % Each character uses 8 bits (1 byte) const = 'shift2 = 30'; fid = fopen('OneZoneModel.dck', 'r+'); fseek(fid, 1102, -1); fprintf(fid, '%s', const); fclose(fid); dos('C:\Programme\TRNSYS17\EXE\TRNExe.exe C:\Programme\Trnsys17\MyProjects\test\callTRNSYS\OneZoneModel.dck /n') Freundliche Grüße, ____________________________________ Arno Dentel - MEng, Dipl.-Ing.(FH) Forschungsgebiet Gebäudesysteme ieg - Institut für Energie und Gebäude Georg-Simon-Ohm-Hochschule für angewandte Wissenschaften - Fachhochschule Nürnberg Keßlerplatz 12 90489 Nürnberg Fon: +49 – 911 – 5880 1846 Fax: +49 – 911 – 5880 5846 E-Mail: arno.dentel@ohm-hochschule.de Web: www.ieg.ohm-hochschule.de P Be green - please print only when necessary. Von: trnsys-users-bounces@cae.wisc.edu [mailto:trnsys-users-bounces@cae.wisc.edu] Im Auftrag von Ehsan Asadi Hi, I know that it is possible to call MATLAB from TRNSYS, Using TYPE 155, but don't know if it is possible to call TRNSYS from MATLAB. What I'm trying to do is using MATLAB optimization tools to solve a multi-objective optimization problem. I'm trying to ask MATLAB to read TRNSYS output file, modify it to create a new input file and initiate TRNSYS. Any ideas? Regards Ehsan |