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Matlab crashes but Octave doesn't

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Douglas Brenner
Douglas Brenner 2019 年 1 月 2 日
回答済み: Douglas Brenner 2019 年 1 月 2 日
The program below runs in Octave but crashes Matlab 2014. Mathworks won't help because my contract has run out. Any ideas would be helpful.
X = [1 , 2 ,3 , 4 ,5];
Y = [1,4,9,4, 1];
xdata = X(:);
A = [xdata.^2, xdata, ones(size(xdata))]
b = log(Y(:));
x = A\b
mu = -x(2)/x(1)/2;
sigma = sqrt( -1/2/x(1) );
A0 = exp(x(3)+mu^2/(2*sigma^2));

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Douglas Brenner
Douglas Brenner 2019 年 1 月 2 日
Ok. But that doesn't mean anything to me.
John D'Errico
John D'Errico 2019 年 1 月 2 日
Essentially, it means you can't use MATLAB for this, at least a too old release on a too new computer. I'm actually surprised MATLAB even started up. Complain to your institution (as if that will help.) But you can try. Argue that as new students enter the system, they are bringing in new (current) computers.
Walter Roberson
Walter Roberson 2019 年 1 月 2 日
Apple made changes to MacOS that prevent older versions of MATLAB from running. (See my previous remarks about external interfaces...)

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James Tursa
James Tursa 2019 年 1 月 2 日
What happens if you do the A\b differently? E.g., doing the LU decomposition manually and then backsolving yourself? Or doing pinv(A)*b?

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Image Analyst
Image Analyst 2019 年 1 月 2 日
If you need it in MATLAB, then pay the money and upgrade. It doesn't crash for me on R2018b. It gives:
A =
1 1 1
4 2 1
9 3 1
16 4 1
25 5 1
x =
-0.511931276922301
3.07158766153381
-2.58955627854091

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Douglas Brenner
Douglas Brenner 2019 年 1 月 2 日
Give that man a cigar and thank you very much.
pinv(A)*b work as I suspect doing the LU decomposition manually would.

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