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# FindMaximum with constraints, WorkingPrecision issue

Posted 11 years ago
 Hello,do you know why the error message in the following example appears? Somehow it appears when introducing the constraint x>0...In[60]:= FindMaximum[{x - 2 x^2, x > 0}, x, WorkingPrecision -> 8]SetPrecision::precsm: Requested precision 8. is smaller than $MinPrecision. Using$MinPrecision instead. >>SetPrecision::precsm: Requested precision 8. is smaller than $MinPrecision. Using$MinPrecision instead. >>Out[60]= {0.12499999, {x -> 0.2500719625311951}}I am using Mathematica 9, my OS is Ubuntu with 64 bit.Thank you in advance,Igor
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Posted 11 years ago
 ok I found the solution myself:In[12]:= FindMaximum[{x - 2 x^2 && x > 0}, x, WorkingPrecision -> 8]Out[12]= {0.12500000, {x -> 0.24995000}}(that is && insted of ,)However still I am wondering what made the difference and why with Maximize the "," works and not the "&&"In[13]:= Maximize[{x - 2 x^2 && x > 0}, x, WorkingPrecision -> 8]Out[13]= Maximize[{x - 2 x^2 && x > 0}, x, WorkingPrecision -> 8]In[6]:= Maximize[{x - 2 x^2, x > 0}, x, WorkingPrecision -> 8]Out[6]= {1/8, {x -> 1/4}}
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