MATLAB Online does not run script properly
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I ran the following script (which I named draft.m) through MATLAB Online:
clear;
fun = @(x, b) (b-7)*(b+5)*x.^2-2*x+3;
brange = -8:0.1:10;
fmin = [];
for b = brange
end
and got the following error message:
>> draft
Error: File: draft.m Line: 6 Column: 1
At least one END is missing. The statement beginning here does not have a matching end.
But if I remove the line
fmin = [];
then it works. Did I miss something? I suppose defining an empty array shouldn't fail the for loop, should it? Thank you very much in advance for any comments that you may have.
3 个评论
Martin
2024-4-10
移动：Dyuman Joshi
2024-4-10
How to convert a matrix from real numbers into a Modulo, for example, how would I convert the following matrix into modulo 7?
M = [7 3 7; 1 0 9; 7 2 8]
Dyuman Joshi
2024-4-10
@Martin, Have you tried searching on the internet or on this forum for the same?
Cris LaPierre
2024-4-10
This is unrelated to this question. Please ask this in a new question.
回答（1 个）
Code runs without error for me. I can also run it here without error. Perhaps try again? If it happens again, perhaps there are more details you can share about what you are doing?
clear;
fun = @(x, b) (b-7)*(b+5)*x.^2-2*x+3;
brange = -8:0.1:10;
fmin = [];
for b = brange
end
b
8 个评论
Kiam Heong Kwa
2022-5-9
The following is the complete code:
fun = @(x,b) (b - 7)*(b + 5)*x.^2 - 2*x + 3;
brange = -8:.01:10;
fmin = [];
for b = brange
f = @(x) fun(x, b);
[crit, fval] = fminbnd(f, -6, 6);
fmin(end + 1) = fval;
end
plot(brange, fmin);
xlabel('b'); ylabel('m(b)'); title('The graph of m(b)');
I am plotting the minima of the parametrized functions 
(given by fun and f in the code) versus b. I am pretty sure it should work -- I ran the code before and I also tried it on GNU Octave just now. Here's the plot from the latter:
(given by fun and f in the code) versus b. I am pretty sure it should work -- I ran the code before and I also tried it on GNU Octave just now. Here's the plot from the latter:
I am really not sure what's happening with my MATLAB Online and hence I posted the question.
Any clues?
Thanks.
Kiam Heong Kwa
2022-5-9
Torsten
2022-5-9
And the error message is the one you posted above:
Error: File: draft.m Line: 6 Column: 1
At least one END is missing. The statement beginning here does not have a matching end.
?
Kiam Heong Kwa
2022-5-9
Just a guess:
What if you use
fmin = [fmin,fval];
instead of
fmin(end+1) = fval;
or even better:
fmin = zeros(numel(brange),1)
for b = brange
f = @(x) fun(x, b);
[crit, fval] = fminbnd(f, -6, 6);
fmin(b) = fval;
end
Kiam Heong Kwa
2022-5-9
Cris LaPierre
2022-5-9
The full code runs fine for me.
Kiam Heong Kwa
2022-5-9
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2022-5-9
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