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How to use private functions lib on ThingSpeak's matlab visualization like local Matlab program?

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Hi all,
I would like to save my several functions once and use them in all my visualizations (as we would do it in every local Matlab program). However, I didn't find any way to do this on Thingspeak. My workaround is to copy+paste all my functions and parameters in every visualization code. This works, but it is not nice.
For example:
main program (source m-file):
% Simple test model to check compatiblity with ThingSpeak
I=[0 0 1 1 5 5 2 2 1 1]; % Assume this random signal simulates the cell current (input) in 10 seconds
for i=1:10
x=I(i);
V_ECM(i)=test_func(x,i); % solve the cell model ODE
end
plot(V_ECM) % plot to see if the model is executed correctly
function program (function m-file):
function y=test_func(x,i)
syms Vc(t)
ode=diff(Vc)+2*Vc==2*x; % Assume this is one diff equation in cell model
cond=Vc(0)==0; % assign initial conditions
Vcsol(t)=dsolve(ode,cond); % solve ODE with the given initial condition
y=Vcsol(i); % sent back calculation at current time stamp i to the main M-file
end
If I want to execute this example in one file on ThingSpeak visualization, it shows following error:
Program:
I=[0 0 1 1 5 5 2 2 1 1]; % Assume this random signal simulates the cell current (input) in 10 seconds
% Simple test model to check compatiblity with ThingSpeak
for i=1:10
x=I(i);
V_ECM(i)=test_func(x,i); % solve the cell model ODE
end
plot(V_ECM) % plot to see if the model is executed correctly
function y=test_func(x,i)
syms Vc(t)
ode=diff(Vc)+2*Vc==2*x; % Assume this is one diff equation in cell model
cond=Vc(0)==0; % assign initial conditions
Vcsol(t)=dsolve(ode,cond); % solve ODE with the given initial condition
y=Vcsol(i); % sent back calculation at current time stamp i to the main M-file
end
Error:
syms requires Symbolic Math Toolbox.
Error in Test>test_func (line 14)
syms Vc(t)
Error in Test (line 7)
V_ECM(i)=test_func(x,i); % solve the cell model ODE
Could anyone help on how can I call functions several time on ThingSpeak visualization like we do in Desktop Matlab program?
Thanks!

Akzeptierte Antwort

Sachin Lodhi
Sachin Lodhi am 25 Apr. 2024
Hi Tanusree,
I understand that you are encountering an error while using syms on ThingSpeak's MATLAB Visualization. As a workaround for this, you can use the 'matlabFunction' to convert symbolic expression to a function handle and then you can use the function handle without Symbolic Math Toolbox.
Here is how you can achieve this -
syms test_func(x, i)
syms Vc(t)
ode=diff(Vc)+2*Vc==2*x; % Assume this is one diff equation in cell model
cond=Vc(0)==0; % assign initial conditions
Vcsol(t)=dsolve(ode,cond);
tF(x,i) = Vcsol(i);
ht = matlabFunction(tF)
ht = function_handle with value:
@(x,i)x-x.*exp(i.*-2.0)
Now you can update the 'test_func' according to the handle 'ht' generated as shown below, to run it on ThingSpeak.
I=[0 0 1 1 5 5 2 2 1 1]; % Assume this random signal simulates the cell current (input) in 10 seconds
% Simple test model to check compatiblity with ThingSpeak
for i=1:10
x=I(i);
V_ECM(i)=test_func(x,i); % solve the cell model ODE
end
plot(V_ECM) % plot to see if the model is executed correctly
function y = test_func(x,i)
y = x-x.*exp(i.*-2.0); % update according to the function handle
end
I recommend you to please go through the following documentation for more information on 'matlabFunction' : https://www.mathworks.com/help/symbolic/sym.matlabfunction.html
I hope this helps!

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