Questions tagged [number-representation]

Questions about interpretation of numeric input or how Mathematica stores and manipulates numbers internally.

13 questions with no upvoted or accepted answers
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NMinimize seems to call function with the same values multiple times

I have to minimize a function where the evaluation of one parameter set takes very long (around 5sec) and discovered alongside, that NMinimize seems to call this ...
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122 views

RealDigits and functional style

So while thinking about Replacing numbers of which you only know certain digits I have faced, again, a problem that I find hard to extract from RealDigits' output ...
3
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0answers
135 views

Rationalize error

The docs state that "Rationalize[x,dx] yields the rational number with smallest denominator that lies within dx of x." However, testing this out it appears to be false. ...
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86 views

Check the data of representations of Lie groups

Is there a way in Mathematica to check the data of representation of Lie groups? For example, the number of generators. the rank (or the dimension) of the representation matrices. and a list of all ...
1
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109 views

LieArt — 3 different 8 dimensional irreducible representation of $\mathrm{SO}(8)$ and their decompositions

I am using the LieArt which you can download freely online https://arxiv.org/pdf/1206.6379.pdf There are three different 8 dimensional $\mathrm{SO}(8)$ irreducible representations, formally it is ...
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162 views

The binary of negative integer number

I have a question about the binary of negative integer number in Mathematica. In most implementations, negative signed integers are stored in what is called two's complement. The other major way of ...
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725 views

How to work with large numbers

How do I browse very large numbers in mathematica, say $10^{{10}^{{10}^{1.414\ldots}}}$? By browse I mean finding the $k$th decimal place before or after the decimal point. Everything I have tried ...
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44 views

Ignoring text when converting strings of text to numbers

I have a string of measurements--mostly numbers, but occasionally an NA. Right now Mathematica is reading it all as text, so I'm using ...
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35 views

Return the precision of the first non zero digit in a number for measurement error representation function

I'd like to return the precision of the first non zero digit in a number. The motivation is so that I can quickly construct my error notation which is the bracketed notation, e.g. $x = 1.234$ with ...
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41 views

Solving a system of linear equations in Mathematica regarding the errors of different methods

I have a system of equations, i.e. 0.62243x + 0.51824y = 0.70524 0.71497x + 0.59496y = 0.80996 I have 3 ways to solve this system (there are more but I am ...
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47 views

Decimal representation in Mathematica 10

I am using a slider to assign the value for a dynamic variable x, and want to display the value of y=10^Dynamic@x in decimal ...
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86 views

Maintaining working precision in my program

I am badly stuck with this program I am writing. I want output of program below to be precise up to 25 digits after decimal point. I am supplying all inputs with precision 25. But after each iteration ...
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147 views

How to parse fraction to a number?

Considering a fraction: val = "F \!\(\*FractionBox[\(1\), \(1\)]\)"; I extract the part of interest: ...