Create a real-time plot in a Fortran cycle by calling Matlab

user_1952213 0
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I have a cycle in Fortran, and I would like to call a Matlab script that at each iteration simply plots the 2 variables I am computing, always in the same figure, in a way that I can see how my solution evolves in time (basically a video)

do i=1,n
   Y(1:m) = blabla 
   X(1:M) = blabla
   write X and Y on file 
   RUN a matlab script which reads file and plots X and Y
enddo

If there is a way to bypass writing on the file and I can pass the variables as an argument even better cause it will be more efficient (I doubt it is possible). Basically, I want the results plotted in real-time so I can catch if the solution is unstable without having to wait until the end of the simulation.

fortran matlab
1 Answers

*Just something that might be useful (feel free to edit and build upon this)

An animated plot may help with the video like plotting that occurs within the same figure. I tried to push as much as I could into a function. No clue how to achieve passing variables to the MATLAB script from Fortran (will look into it).

But if you were willing to calculate all the points first and then pass them to MATLAB to be animated this might help (a caveat is that this wouldn't have that real-time timing when the data is calculated and immediately passed for plotting).

Animated Plot

clf;
Animated_Plot = animatedline;

for x = 0: +1: 100    
    y = 0.5*x;
    Add_Data_Points(x,y,Animated_Plot);
end

function [] = Add_Data_Points(x,y,Animated_Plot)
    hold on
    addpoints(Animated_Plot, x, y);
    drawnow
    axis([0 100 0 100]);
    xlabel("x"); ylabel("y");
end

Ran using MATLAB R2019b

user_136690870
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