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Warning: Matrix is singular to working precision.

by mikeph
Tags: matrix, precision, singular, warning, working
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mikeph
#1
Apr13-10, 05:55 AM
P: 1,212
Hello

I am generating a matrix which is coming up with this warning.

I know the matrix elements are correct though, as I put them in. But when I work with the matrix, the results don't make sense. I presume this warning is the reason.

Can anyone help? I don't understand why MATLAB can't just store the data I put in it properly. It is in the range 10^1 - 10^12. Is it just working to a single power and losing all the data which does not appear in the decimal representation? (rather than storing the exponent).

I don't understand how it works or how to work around this.

Thanks,
Mike
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HallsofIvy
#2
Apr13-10, 06:07 AM
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PF Gold
P: 39,542
It's not clear to me why you think MATLAB is NOT storing the data you put in. A matrix will be "singular to working precision" if its determinant is less than that precision. What is the determinant of your matrix?
mikeph
#3
Apr13-10, 06:26 AM
P: 1,212
It is not square.

Perhaps this is not the reason I am getting an error later on, it just seems to be a good candidate for investigation!


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