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Calculators and excel have different answer to matlab for inverse of a matrix

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Atreyu91
Atreyu91 2015-9-20
评论： Walter Roberson 2015-9-20
I have a code which calculates a 10x10 matrix for every value of k. When I perform an inverse of the matrix, I can get an answer. However when I use Excel, TI-NSPIRE calculators and online calculators they give me a different answer than what is produced in matlab.
Also as k increases eventually the matrix becomes singular according to matlab, however Excel, TI-NSPIRE calculators and online calculators can manage to calculate the answer.
Can anyone explain why matlab is different to everything else?
I have tried using
pinv()
but the answer is still not correct
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the cyclist
the cyclist 2015-9-20
Fully acknowledging that I may be biased ...
Out of all the sources of matrix calculation you have mentioned, I would trust MATLAB the most.
I agree with Image Analyst, attaching an example where you see differences is key to us all understanding this.
Walter Roberson
Walter Roberson 2015-9-20
When I try a 5 x 5 in MATLAB I get the same result as in Maple, to within round-off error.
What is rcond() of your matrices?

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