22 questions linked to/from Confused by (apparent) inconsistent precision
848 views

### N[number, 100] does not give 100 decimal places [duplicate]

Please look at this computations: a = N[Sqrt, 20]; N[a^2, 100] The output is 2.0000000000000000000, which is apparently not $a^2$ to 100 decimal places. What'...
1 vote
312 views

### Why is Mathematica not able to calculate more digits [duplicate]

When I want a numerical value with a precision of 50 digits... N[1.15/(1 - E^-0.2)^2, 50] Why is Mathematica not able to provide the desired solution? And I know ...
172 views

### Mathematics arbitrary precision evaluation [duplicate]

I am trying to solve a simple expression: where a = 77617, and b = 33096. Wolfram|Alpha returns a correct result, using ...
1 vote
109 views

### Improving working precision of LegendreP[n,x]? [duplicate]

I was trying to evaluate N[LegendreP[5,0.1]] The cell gives me: N[LegendreP[5,0.1]]=0.178829 However I wanted more ...
169 views

### Precision digits in Log[] [duplicate]

Why does N[Log[10, 6613], 20] give the requested 20 digits of precision (* $3.8203985227039816648$ *) but ...
51 views

### Numerical Results with replacement rules [duplicate]

Why are the following outputs different? N[(x^2 + y^2) /. Thread[{x, y} -> {1., 1.}], 10] gives 2.. N[(1^2 + 1^2), 10] ...
3k views

### Funny behaviour when plotting a polynomial of high degree and large coefficients

I am trying to plot a polynomial of degree $29$ on the domain $[0,1]$, with fairly large coefficients: ...
4k views

### Annoying display truncation of numerical results

I have a lot of data to inspect. An example of a number in my program is 123.189094 This gets displayed as 123.189 ...
1k views

### Complex result for real vectors in VectorAngle

Bug introduced in 10.0 or earlier and fixed in 12.0.0 or earlier I was expecting a real angle using VectorAngle when passing real valued vectors, but I obtained a ...
3k views

### A problem about function N

Toady,I have a problem about N,described as below: For example N[1/3, 5] (* ==> 0.33333*) and ...
921 views

### Why is Mathematica's default precision only 16 digits? [closed]

I was performing some basic computations when I noticed that NumberForm[N[Zeta], {100, 100}] yields ...
1k views

### Converting to machine precision

There are multiple ways to convert an expression to machine precision, for example: ...
1k views

### Faster Eigenvalues with lower precision goal

I compute all eigenvalues of a large matrix, and I decide that the speed is more important than the precision. Then the question is, can I speed up Eigenvalues[] by ...
1 vote
2k views

### Adding precision for the calculation of a function

I have some function $f(x)$ I wish to evaluate, which is yielding divide-by-zero errors for sufficiently large inputs. How do I increase the precision with which this function is evaluated in order ...