sometimes I get a warning : rank deficient

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William Campbell 2020-3-1

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评论： William Campbell 2020-3-2

sometimes I get a Warning: Rank deficient, rank = 0, tol = 0.000000e+00 and it points to an equation in a loop :

a = sqrt(abs(x/x-d))); where x and d are scalars

my results seem plausible, but should I be concerned about this warning ?

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William Campbell 2020-3-2

Thanks for your fast response - it looks like I had updated my x variable further into my script and created a conflict. All sorted now. Thanks again.

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Answer 1

Matt J 2020-3-2

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编辑：Matt J 2020-3-2

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should I be concerned about this warning

If the line you've shown is what caused the warning, then it's likely x and d are not both scalars as you intended. You might need to be concerned about that.

Incidentally, this line looks like it should be,

a = sqrt( abs( x./(x-d) ) );