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Results tagged with evaluation
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user 14489
Questions about how Mathematica evaluates expressions, tracing evaluation (Trace*), handling expressions in unevaluated form (Hold*, Unevaluated), nonstandard evaluation, etc.
2
votes
How to extract part of a held expression without evaluating it
Like so:
Attributes@holdFormComplete={HoldAllComplete}
MakeBoxes[holdFormComplete@a_,f_]:=MakeBoxes[HoldForm@a,f];
w=4;
Extract[Hold[w=3],{1,1},holdFormComplete]
%//FullForm
(*w*)
(*holdFormComplete[ …
- 1,955
8
votes
Accepted
What is wrong with RuleCondition here?
Update Jan 22nd: WRI Tech Support indicates that the fixes for all the test cases below, including the ones that don't depend on SameQ, may land in the next point release. The fixes could miss the poi …
- 1,955
20
votes
2
answers
734
views
What is wrong with RuleCondition here?
Bug introduced in 9.0 or earlier and fixed in 10.4
Hold@1`5 /. x_Real :> RuleCondition[N@x, True]
Hold@1`5 /. x_Real :> RuleCondition[N@2`5, True]
Hold@2`5 /. x_Real :> RuleCondition[N@2`5, True]
H …
- 1,955
4
votes
NMinimize with NIntegrate (crash in symbolic evaluation, memory leak)
{a->p,d->1},ggxExprFN/.fitTestParm,{{x,-kernelSize,kernelSize},{y,-kernelSize,kernelSize}},{p,s},{(s>0),(0<=p<=1)},"DifferentialEvolution","QuasiMonteCarlo",100]
During evaluation of In[209]:= NIntegrate … NIntegrate obtained 170.3335009372765` and 51.646836786706295` for the integral and error estimates. >>
During evaluation of In[209]:= NIntegrate::maxp: The integral failed to converge after 100 integrand …
- 1,955