Output argument not assigned?
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Recieve the Error Message When Executing this code, Why is this happening?
Output argument "PID_Performance" (and possibly others) not assigned a value in the execution with "getPerformancePlots" function.
Error in test (line 2)
[PID_Performance,Grill_Status,Component_Performance]=getPerformancePlots(P,I,D,u,grill_state,Temp_F,Auger_RPM,Auger_PWM,Fan_PWM,glowplug_status);
function[PID_Performance,Grill_Status,Component_Performance]=getPerformancePlots(P,I,D,u,grill_state, Temp_F, Auger_RPM, Auger_PWM, Fan_PWM,glowplug_status)
PID_Performance=figure('Name','PID Performance','WindowState','normal','Visible','on');
hold on;
yyaxis left
ylim([-2 2])
xlabel('Time (s)');
ylabel('PID Value');
yticks('auto');
plot(P,'Color', [.13 .13 .13],'LineStyle','-');
plot(I,'Color',[0.9290 0.6940 0.1250],'LineStyle','-');
plot(D,'Color',[0 0.4480 0.7410],'LineStyle','-');
plot(u,'r','LineStyle','-');
yyaxis right;
plot(Temp_F,'Color','#E0932C','LineWidth',1);
if numel(grill_state)>20000
xticks('auto');
elseif numel(grill_state)<5000
xticks(0:500:numel(grill_state));
else
xticks(0:1000:numel(grill_state));
end
ylabel('Temperature (F)');
grid on;
legend('P','I','D','u','Temp F','Location','southoutside','Orientation', 'horizontal');
hold off;
%% Create Grill Status Plot
Grill_Status=figure('Name','Grill Status','WindowState','normal','Visible','on');
grid on;
plot(glowplug_status,'Color','#D95319');
hold on;
plot(grill_state,'LineStyle','--','Color','#77AC30');
xlabel('Time (s)');
yticks(0:1:5)
if numel(grill_state)>20000
xticks(0:2000:numel(grill_state));
elseif numel(grill_state)>10000
xticks(0:1000:numel(grill_state));
else
xticks(0:500:numel(grill_state))
end
legend('Glowplug Status',"Grill State",'Location','southoutside','Orientation','horizontal')
%% Create Component Performance Plot
Component_Performance=figure('Name','Component Performance','WindowState','normal','Visible','on');
grid on;
xlabel('Time (s)');
if numel(grill_state)>20000
xticks("auto");
else
xticks(0:1000:numel(grill_state));
end
yyaxis right;
plot(Temp_F,'Color','#E0932C','LineWidth',1,"DisplayName","Probe Temp F");
hold on;
ylabel('Temperature (F)')
yyaxis left;
yticks(0:50:max(Auger_RPM.*100));
ylabel('PWM/RPM');
plot(Auger_PWM,'LineStyle','-','Color','#FAA533',"DisplayName","Auger PWM");
plot(Auger_RPM.*100,'LineStyle','-','Color','#21ABDE',"DisplayName","Auger RPM");
plot(Fan_PWM,'LineStyle','-','Color','#94918D',"DisplayName","Fan PWM");
legend('Location','southoutside','Orientation','horizontal')
end
>>
7 Comments
Nicholas Kavouris
on 26 Oct 2022
Torsten
on 26 Oct 2022
How do you call the function ?
Nicholas Kavouris
on 26 Oct 2022
Edited: Nicholas Kavouris
on 26 Oct 2022
Jan
on 26 Oct 2022
The code looks fine. Then the logical conclusion is, that you do not run it, but another code. Maybe there is another instance of the getPerformancePlots.m file? There are 2 ways to check this:
which getPerformancePlots -all
or set a breakpoint in the code and check, if it is really reached.
Nicholas Kavouris
on 26 Oct 2022
Nicholas Kavouris
on 26 Oct 2022
Jan
on 27 Oct 2022
You see, that there are 2 functions with the same name. Are you sure, that the posted function is the one, which produces the error message?
Answers (2)
Image Analyst
on 26 Oct 2022
If you return output variables you need to set them. You did not for the Grill_Status and Component_Performance return variables. Try this:
function[PID_Performance, Grill_Status, Component_Performance]=getPerformancePlots(P,I,D,u,grill_state, Temp_F, Auger_RPM, Auger_PWM, Fan_PWM,glowplug_status)
% Initialize all return variables to null.
PID_Performance = [];
Grill_Status = [];
Component_Performance = [];
% Now start the function statements.
PID_Performance=figure('Name','PID Performance','WindowState','normal','Visible','on');
% and so on.
2 Comments
Nicholas Kavouris
on 27 Oct 2022
Image Analyst
on 27 Oct 2022
I don't see how it can say they're not assigned when you did it immediately upon entering. OK how about if the function definition is only these 4 lines:
function[PID_Performance, Grill_Status, Component_Performance]=getPerformancePlots(P,I,D,u,grill_state, Temp_F, Auger_RPM, Auger_PWM, Fan_PWM,glowplug_status)
% Initialize all return variables to null.
PID_Performance = [];
Grill_Status = [];
Component_Performance = [];
Try that. You'd better not get that "output arg not assigned" error or else you're not running the actual piece of code you think you are.
sui en
on 4 Apr 2023
0 votes
This problem is easy to solve, and when assigning a value to a variable in a function, it needs to be declared first.
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on 26 Oct 2022
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