Infinite while loop in Matlab function block

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Matthieu GATINE
Matthieu GATINE 2018-10-5
回答： Walter Roberson 2018-10-8
I have made this programm to implemente it in a Matlab function block in Simulink :
function Open_area1 = fcn(Moisture_Sensor_area_1_OUT,Moisture_instruction_min,Moisture_instruction_max)
Open_area1 = 0;
if (Moisture_Sensor_area_1_OUT<Moisture_instruction_min)
while(Moisture_Sensor_area_1_OUT<Moisture_instruction_max)
Open_area1 = 1;
end
end
end
But the while loop make an infinite simulation time.
  2 个评论
KALYAN ACHARJYA
KALYAN ACHARJYA 2018-10-5
That means the following condition is always true
Moisture_Sensor_area_1_OUT<Moisture_instruction_max
Do same sort of modification (update), so that it not true after some required iteration
Matthieu GATINE
Matthieu GATINE 2018-10-5
编辑：Matthieu GATINE 2018-10-5
How can I update the value of Moisture_Sensor_area_1 when the function block is in the loop ? Does the simulation is stop during the execution of the function block ?
The input signal is a sampled sinus.

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采纳的回答

Walter Roberson
Walter Roberson 2018-10-8
Output = double(Input >= Min & Input <= Max) ;
No loop. No if. But you do need to substitute appropriate variables.

更多回答（1 个）

TAB
TAB 2018-10-8
I guess, you are trying to run the loop for checking Moisture_Sensor_area_1_OUT<Moisture_instruction_min condition for every sample time.
But Simulink's Matlab Function runs in different way. It is invoked at every sample time during model execution.
At t=0, Get the 3 function inputs from previous blocks, Call fcn with inputs, collect fcn output and send to next block
At t=1, Get the 3 function inputs from previous blocks, Call fcn with inputs, collect fcn output and send to next block
At t=2, Get the 3 function inputs from previous blocks, Call fcn with inputs, collect fcn output and send to next block
...
... and so on.
Inputs to fcn remains same during the a sample time, so loop will always run into infinity.
You don't need to use while loop. You can just use if condition to set output.

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