Linked Questions
18 questions linked to/from How to flush machine underflows to zero and prevent conversion to arbitrary precision?
2
votes
0
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566
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how to calculate with just double floating point precision [duplicate]
I want to calculate with simple double floating point precision.
...
- 21
8
votes
1
answer
327
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Exp of big negative numbers [duplicate]
I noticed that Exp have a strange behaviour with big negative numbers
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- 43.3k
6
votes
0
answers
167
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Can I force Mathematica to use machine precision? [duplicate]
Some built-in functions (like Exp) give an arbitrary precision result, even when the argument is a machine precision number. Example:
...
- 35.8k
3
votes
0
answers
110
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Calculating eigensystem of a matrix containing very small numbers [duplicate]
I'm dealing with a matrix containing very small numbers like 10^(-370). When I compute the eigensystem of my matrix, it takes too much time, though the matrix size is not large.
Can anyone explain ...
- 1,149
16
votes
8
answers
3k
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Product of elements of a list
Sum is for functions; Total is for a list. Product is for a function; what is the command ...
user21376
28
votes
4
answers
1k
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SetOptions locally?
Is there a way to SetOptions locally? For example, I have a Module and inside it I am doing a lot of ...
- 11k
13
votes
5
answers
1k
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NDSolve DAE with Constraints
I'm trying to make some numerical simulation with NDSolve. I have encountered a few problems. Here is a simplified version of the equations:
...
- 1,431
22
votes
2
answers
479
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Plotting a defined function gives different results from plotting the function directly
Consider the following piece of code:
function[t_]:=Exp[-9 t^2];
LogLogPlot[{function[t],Exp[-9 t^2]},{t,.01,100}]
I expect the two plots to exactly overlap each ...
- 529
8
votes
3
answers
6k
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Machine precision near zero: not fulfilled?
I am puzzled by the behavior of Mathematica machine precision with numbers approaching zero. This manifests itself, e.g., with FixedPoint and the like.
In the ...
- 1,572
17
votes
2
answers
341
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CompiledFunction returns machine numbers smaller than $MinMachineNumber
When thinking on the workaround for this LogLogPlot bug suggested by halirutan I noticed that CompiledFunction actually can ...
- 61k
12
votes
1
answer
810
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Why does 1 - Exp[-10.0^12] cause an out-of-memory error?
I would like to understand why evaluation of the expression
1 - Exp[-10.0^12]
causes an out-of-memory error and how can I prevent such errors when calculating ...
- 7,736
8
votes
1
answer
945
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DSolve with SetOptions[Solve, Method -> Reduce] Behaving Differently in Ver 11.1.1
With version "11.1.1 for Microsoft Windows (64-bit) (April 18, 2017)",
DSolve[{SI'[s] == Sin[PH[s]] , PH'[s] == Sin[SI[s]]/e}, {SI[s], PH[s]}, s]
produces the ...
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4
votes
3
answers
776
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Why does DSolve return two solutions for my ODE?
I wanted to solve the differential equation: $y’ = (1+2x)\sqrt{y}$ with $y(0) = 1$. It can be done by hand, and to check my answer I typed the following in Mathematica
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5
votes
2
answers
813
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Underflow error General::munfl from E^x instead of Exp[x]
In contrast to earlier versions, Mathematica 11.3 and 12.0 generate lots of underflow errors from my code, e.g.
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4
votes
2
answers
281
views
Change lighting in ChromaticityPlot3D
It looks to me like ChromaticityPlot3D has some default lighting, but unlike most Graphics3D functions the Lighting option doesn't seem to have any effect.
However, the documentation states "...
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