PID in ThingSpeak code

I tried to write pid code in thingspeak app matlab analysis, but I faced some problem. Can anyone help?

sensed_output = thingSpeakRead(readChannelID), control_signal;
setpoint=23;
Kp = 1;
Ki = 1;
Kd = 1;
T= 5000;

double total_error, last_error;
int  max_control=100;
int  min_control=0
double error = setpoint - sensed_output;
total_error += error; 
if total_error >= max_control
    total_error = max_control;
elseif total_error <= min_control
    total_error = min_control;
else
    total_error = total_error;      
end
double delta_error = error - last _error; 
control_signal = Kp*error + (Ki*T)*total_error + (Kd/T)*delta_error; 
if control_signal >= max_control
    control_signal = max_control;
elseif control_signal <= min_control 
    control_signal = min_control;
else
    control_signal = control_signal;     
end       
last_error = error;
analyzedData = control_signal;00
%% Write Data %%
thingSpeakWrite(writeChannelID, analyzedData, 'WriteKey', writeAPIKey);

[Image Analyst]

Do not use double or int before the lines where you assign values.

Answer 1

[Christopher Stapels]

I'd suggest you have a look at the MATLAB onramp. Its a two hour introduction to MATLAB fundamentals, I think you would find it really helpful. Once you have that down, I think writing the PID code will be much easier.