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Mathematics Wolfram Language Numerical Computation

Avoid machine precision issues while using FindRoot?

Posted 5 years ago

I am facing Precision error in Find Root FindRoot::lstol: The line search decreased the step size to within tolerance specified by AccuracyGoal and PrecisionGoal but was unable to find a sufficient decrease in the merit function. You may need more than MachinePrecision digits of working precision to meet these tolerances.

POSTED BY: Muhammad Atif Masoud

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Posted 5 years ago

It would be a good idea to isolate a single stand-alone `FindRoot` call that elicits the problem. One thing I can point out is that some of the values have very different scales and so maybe rescaling will help. Also you can lower the `PrecisionGoal` and related settings.

POSTED BY: Daniel Lichtblau

Posted 5 years ago

Sir my question is that what will the command to remove this error. I attached the relevant computation. You can see the following errors in it

POSTED BY: Muhammad Atif Masoud

Posted 5 years ago

Sir my question is that what will be the command to remove this error. I attached the relevant computation. You can see the following errors in it. Normally when i do such type of calculations which are very smooth and fast. Attachments: image_2019_06_16...png image_2019_06_18...png image_2019_06_18...png image_2019_06_18...png