how to create a changing variable for fsolve?

i want fsolve to calculate the output for different uc each time (increasing uc by 0.001 each time). each output from fsolve should be sent to a simulink model seperatly. so i set a loop to do so, but i believe that at the currenty constellation (if it will work)will just calculate 1000 different values? is there a way to send out the values seperately?

if not, how can i create a parameter uc. that goes from 0 to say 1000? i tried uc=0:0.1:1000, but again, the demension doen't seem to fit.

how do i create a function that takes the next element of a vector/matrix each time the function is called?

best regards

Answer 1

[Walter Roberson]

function Result = f(YourArray)
persistent iteration_number
if isempty(iteration_number); iteration_number = 0; end
iteration_number = iteration_number + 1;
if iteration_number > numel(YourArray);
  Result = [];
  iteration_number = [];  %reset for next cycle
  return;
end
Result = some expression in YourArray(iteration_number)
end

Please also read the documentation for fsolve() as you cannot pass in parameters the way you do. Please see the section about parameterizing the function.

[Hana]

thanks for your help! i used a for loop to describe the changes on the variable, but the old results gets overwritten everytime it starts a new loop. is there any possibilities to get updated the values from each loop? or do i automatically get the updated values when i load the results of each value into simulink? the function in simulink will be called every 0.001s.

best regards

[Walter Roberson]

Instead of using a for loop in your MATLAB code, use a MATLAB Function Block at the Simulink level with the appropriate that takes a single input (or no input at all) and outputs a single result, controlling invocations of the block at the Simulink level, either via the Simulink equivalent of a for loop or by taking a signal as input where the signal value indicates the parameter to use for fsolve()

[Hana]

i think i understood the method you are suggesting, but i'm having trouble realizing it. i found the function-call-generator in simulink, but i'm not sure how to call the fsolve from there, since i can't write the fsolve into the matlab function directy and coder.extrinsic only calls functions and not scripts...

[Walter Roberson]

Write a Level 2 S function if necessary.

There is a lot about Simulink that I have not put together mentally yet, as I do not have access to it myself.

[Hana]

thank you, i will try that. &thanks for taking time answering my questions :)