Why are my graphs closing when I use the matlab api?

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Josh Cohenour
Josh Cohenour 2017-6-19
评论： Tianya Duan 2020-3-25
I'm having an issue where I run this code in my matlab python api and the graph closes right after all the assets load onto the graph and can't seem to figure out why, I'll leave an example I found that does exactly what i was saying. Any help would be very much appreciated.
import matlab.engine
eng = matlab.engine.start_matlab()
eng.eval("T = readtable('patients.dat');",nargout=0)
eng.eval("S = table2struct(T,'ToScalar',true);",nargout=0)
eng.eval("disp(S)",nargout=0)
D = eng.workspace["S"]
smoker = matlab.logical(D["Smoker"])
pressure = D["Diastolic"]
pressure.reshape((1,100))
pressure = pressure[0]
smoker.reshape((1,100))
smoker = smoker[0]
sp = [p for (p,s) in zip(pressure,smoker) if s is True]
nsp = [p for (p,s) in zip(pressure,smoker) if s is False]
print(len(sp))
print(len(nsp))
sp = matlab.double(sp)
nsp = matlab.double(nsp)
print(eng.mean(sp))
print(eng.mean(nsp))
sdx = eng.linspace(1.0,34.0,34)
nsdx = eng.linspace(1.0,34.0,66)
eng.figure(nargout=0)
eng.hold("on",nargout=0)
eng.box("on",nargout=0)
eng.scatter(sdx,sp,10,'blue')
h = eng.scatter(nsdx,nsp,10,'red')
h = eng.xlabel("Patient (Anonymized)")
h = eng.ylabel("Diastolic Blood Pressure (mm Hg)")
h = eng.title("Blood Pressure Readings for All Patients")
h = eng.legend("Smokers","Nonsmokers")
x = matlab.double([0,35])
y = matlab.double([89.9,89.9])
h = eng.line(x,y,"Color","blue")
h = eng.text(21.0,88.5,"89.9 (Smoker avg.)","Color","blue")
y = matlab.double([79.4,79.4])
h = eng.line(x,y,"Color","red")
h = eng.text(5.0,81.0,"79.4 (Nonsmoker avg.)","Color","red")code

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回答（1 个）

Robert Snoeberger
Robert Snoeberger 2017-6-22
My guess is that MATLAB is exiting when your script finishes. Since you are starting a new MATLAB session, the lifetime of MATLAB is tied to the lifetime of the variable 'eng'. You could consider using a shared MATLAB [1].
[1] https://www.mathworks.com/help/matlab/apiref/matlab.engine.connect_matlab.html
  2 个评论
Robert Snoeberger
Robert Snoeberger 2017-6-22
You could also add some code at the end of your script to make Python wait for the figure to be closed. One way might be to loop while the figure handle is valid:
while eng.isvalid(h):
pass
isvalid(h) will return False when the figure is closed.

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