I assume I can attach a plot for you here - if the attachment goes through, that's what the output looked like for me for m=1, c=1, k=1 (critically damped, which looks correct) with an initial stretch of 2 and velocity of 4. You can save the script in a Query Editor window, to a file, or to the Clipboard. You can choose one of several types of scripts for example to create, alter, or drop the object. With that correction, your program seems to work. You can use the Object Explorer Script as menu to script a single object, script multiple objects, or script multiple statements for a single object. This forces Freemat to do the multiplication element-by-element instead of a matrix multiplication. after the first expression, like so: x=A*exp(-z*w*t.)*sin(wd*t+phi). To do an element-wise multiplication, which is what I assume you want, simply put a. This results from trying to multiply two matrices whose dimensions don't match up correctly, namely (A*exp(-z*w*t)) and (sin(wd*t+phi)). In C:/Users/tj/Desktop/Vibo_amo.m(Vibo_amo) at line 12Įrror: Requested matrix multiplication requires arguments to be conformant. If you try to run it as is, you'll come up with the error: Also, I gave your program a run, you have a debugging error in line 12. If you want to do further manipulation, you'll want to run it as a script (i.e.: take the first line out, define your variables inside the script explicitly, then you can source the script or just type its filename at the prompt). The arguments give you the ability to change the variables at will from the command line, but bear in mind that once the function has executed, you will not be left with any of your calculated variables from inside the function. You need to just type the function name with the arguments, like so: It thus is trying to access a file that hasn't been created yet.Because you specifically named this a function, to which you pass arguments, you can't execute it line-by-line with the source command. Of course! The error comes while matlab is still in the process of opening. IOError: No such file or directory: 'output.txt'
All of them give me similar errors: C:\Users\gp\Documents\Documents\personal\educacion\Discrete Optimization\knapsack>python2 solver.py data/ks_19_0 data/ks_4_0)'Īs you see, I've tried with subprocess.call, popen, os.system. Please select one from the data directory. Input_data = ''.join(input_data_file.readlines()) Input_data_file = open(file_location, 'r') # output_data += ' '.join(map(str, taken)) # prepare the solution in the specified output format Subprocess.call('matlab -r gp(\'tmp.data\')',shell=0) # process = Popen('matlab -r gp(\'tmp.data\')', stdout=PIPE) # subprocess.call('matlab -r gp(\'tmp.data\')', shell=1)
#Execute a script in freemat code
# Modify this code to run your optimization algorithm The python script should then read from that output and convert it to the result that the grading script expects.Īll runs fine, except I haven't been able to make Python wait for the call to Matlab to complete and therefore generates an error on the following lines.
m file reads a file called tmp.data and writes the output to output.txt. m file and wanted to call it from Python (the python code will be called by a grading python script). I developed the solution (an optimization algorithm) in Freemat / octave / matlab. I'm new to python, which I need to use for an assignment in a course.
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