# Questions tagged [precision-and-accuracy]

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### Indeterminant numerical value of summation

I have the following two-fold summation. ...
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### Precision problem with mathematica

I have a precision problem with a complicated function in Mathematica. I need to get norm (NIntegrate[f[x],{x,0,1}]) and shape (...
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### SetPrecision with Manipulate using variable number of controls

I want to convert inputs from controls in Manipulate into exact numbers and have two kinds of inputs: parameters: there are a fixed number of these rates: the number of rates is controlled by the ...
60 views

### Mathematica accuracy errors when creating data

I created training data for a neural network and below are two errors I got The only code that uses "FindRoot" command is the following ...
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### Why increasing PrecisionGoal and WorkingPrecision is deteriorating my results

I am minimizing a variable subject to many very complicated constraints, like ...
29 views

### General::munfl - Precision lost in LinearModelFit

I am new to mathematica so I am confused regarding the loss of precision in LinearModelFit. In building a linear model with uora (1 or 2) and encodeSeverity (1,2 or 3) ...
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### How to deal with too small numbers

When dealing with a code that produces too small numbers (in a complicated way) like 0.33691 4.015757066049965*10^-330 I get the following warning General::munfl: ...
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### Accurately computing $\sum_{j=2}^\infty \frac{(-x)^j}{j!} \zeta(j)$

I'm doing a sanity check of the following equation: $$\sum_{j=2}^\infty \frac{(-x)^j}{j!}\zeta(j) \approx x(\log x + 2 \gamma -1)$$ Naive comparison of the two shows a bad match but I suspect one of ...
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### Solving a determinant to get non-zero roots in a heat transfer problem

I am trying to solve a mathematical model of a heat transfer problem. As an intermediate step there is a characteristic equation in the form of a determinant, which needs to be solved for variable <...
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### How do I increase an amount of digits after the point?

I have an expression such as: Log[0.784637, 517.8796]*ArcTan[-1.112673]*0.4256^(-2.034)*Sqrt[3.567] and I get 3 digits precision. I tried: ...
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### N::meprec warning when setting precision

How come N[ Log[ Cos^2 + Sin^2 ] ] evaluates to 0. without any trouble, while ...
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### Why can't Mathematica express a minus operation between two decimal numbers with several places? [closed]

A example of the problem. This is a print from mathematica with the demonstration of the issue.
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### How to set Working Precision/ Accuracy global for the entire notebook in mathematica

F1[r]=((37.3042 - r) (-25.578 + r) (62.8822 + r))/(3000 r) FindMaximum[F1[r], r] The output is {0.0345106, {r -> 31.0723}}. ...
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### How to make FindRoot work with PolyLog functions

I have the following code: ...
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### How to control floating point precision when Exporting to obj format?

Suppose we have a MeshRegion that we want to export to an obj file with, say double precision. Is that possible with Export? And ...