[FIXED] How can I put my simulation result into a .txt file when it is an array?

Issue

I simulated a model with this script and now I just want to substitute T1 with a symbol t1 in a text file

How should change the T1 from array to something else so that I can substitute that ?

from pymodelica import compile_fmu
        from pyfmi import load_fmu
        # Import the plotting library
        import matplotlib.pyplot as plt
        import numpy as np
        # Compile model
        model_name = 'Testerequal'
        mo_file = 'Testerequal.mo'
        VDP_fmu = compile_fmu('Testerequal', compiler_options = {'extra_lib_dirs':'D:\JModelica.org-1.17\Testerequal'})
        # Load model
        vdpid = load_fmu(VDP_fmu, log_level=7)
        res = vdpid.simulate(final_time=86400)

        x0= res["int.y"]
        t0= res["time"]

        T1 = x0[40] 

    f = open('D:/JModelica.org-1.17/Testertwo/That.txt','r')
filedata = f.read()
f.close() 

    newdata = filedata.replace('t1',T1)

    f = open('D:/JModelica.org-1.17/Testertwo/That.txt','w')
f.write(newdata)
f.close()

Solution

The problem is that you are trying to substitute an string with a numpy float.

The variable x0 in your case is a numpy array of floats and thus T1 is a numpy float. Now when you try to substitute t1 it will give you an error due to that T1 is not a string. If you just want to substitute the value of T1 for t1, just convert it to a string, i.e.:

    filedata.replace("t1", str(T1))

Answered By - Christian Winther