Why do I recieve an error?

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Axelina Lindgren
Axelina Lindgren 2021-4-26
评论： Star Strider 2021-4-27
When I run the program I get the error message:
Insufficient number of outputs from right hand side of equal sign to satisfy assignment.
Error in OptikVaglaraUppgift2 (line 78)
[difference minIndex(ii)] = min(diff(:,ii));
The program worked yesterday but when i opened up Matlab again it couldn't run.
Can someone please help me solve the problem and explain what is wrong?
n1 = 1; %utanför linsen
n2 = 1.5; %i linsen
D = 10; %linsens diameter (cm)
R = D./2; %linsens radie (cm)
d = 10; %fokallängd (cm)
lopt = n1*sqrt(d.^2 + R.^2); %Optiska vägen då strålen inte bryts i linsen
Y = linspace(0, R, 1000);
X = linspace(0, d, 1000);
for ii = 1:length(Y)
LoptTemp = zeros(length(Y), length(Y));
L1(:,ii) = sqrt( (d-X).^2 + Y(ii).^2)*n1;
L2(:,ii) = X*n2;
LoptTemp(:,ii) = L1(:,ii) + L2(:,ii);
diff(:,ii) = abs(LoptTemp(:,ii) - lopt);
[difference minIndex(ii)] = min(diff(:,ii));
x_fit(ii) = X(minIndex(ii));
end
figure
plot(x_fit, Y, 'black');
hold on
plot(x_fit.*-1, Y, 'black');
hold on
plot(x_fit, -Y, 'black');
hold on
plot(x_fit.*-1, -Y, 'black');
hold on
ylim([-max(Y)-3, max(Y)+3]);

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回答（2 个）

Steven Lord
Steven Lord 2021-4-26
Let's make sure you haven't written your own min.m function that shadows the built-in min function.
which -all min
If that doesn't resolve the problem, you wrote:
The program worked yesterday but when i opened up Matlab again it couldn't run.
What if anything changed between the last time the program worked yesterday and the first time it failed to work today? Did you install any new toolbox or add-on, did you create any new files, etc.?
  1 个评论
Axelina Lindgren
Axelina Lindgren 2021-4-26
I don't know if I understand how to use your code... (Pretty new to Matlab) And I can't think of anything I've changed since yesterday. I program in Eclipse with Java at the same time but it shouldn't interfere with Matlab, at least it hasn't before. It is also weird that other people can get it to work while I can't...I haven't changed any of the settings either.
I can try and write it in a new m file manually but if I just copy paste I still get the same error.

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Axelina Lindgren
Axelina Lindgren 2021-4-27
Solved it! I had a value called min in my previous code which changed the min function. To solve I simply put clear at the top of the code and now it works!
  1 个评论
Star Strider
Star Strider 2021-4-27
Note that clear is not the best option.
It would be best to go back and re-name the offending variable or function to something that does not overshadow any MATLAB functions, and still makes sense in the context of your code.

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