All Questions
Tagged with precision-and-accuracy functions
12 questions
2
votes
2
answers
228
views
How can I make sure that there are real roots for the given function? Can I trust the plot only?
I have this function
$$f(x)=(\pi -2 x)^2 \sin \left(\frac{\pi ^2}{2 x-2 \pi }+\frac{1}{2} \csc ^{-1}\left(\frac{4 \pi (\pi -x) \csc \left(\frac{\pi ^2}{x-\pi }\right)}{4 (\pi -x)^2+\pi ^2}\right)\...
- 749
0
votes
2
answers
59
views
Confused by results of a simple computation [duplicate]
If I define
f[x_] := (1 - Exp[-2 x^2])/(x Sin[x])
and then enter
N[f[10^-5] - 2, 100]
I get the result
$$-1....
- 137
0
votes
1
answer
82
views
Is there an alternative way instead of increasing the number of plotpoints in RegionPlot to get a better result?
I have this function and I use RegionPlot to see in which part of the domain, the function is negative:
...
user73733
0
votes
2
answers
109
views
How can I make sure that the plot of this function cross each other or not?
I have this function:
$$\frac{1}{16} \left(\sinh (\pi x) \left(64 \left(x^2-4\right) \cosh \left(\frac{2 \pi x}{3}\right) \cos (y)+\left(x^2+4\right)^2+256 x \sinh \left(\frac{2 \pi x}{3}\right) \...
user73733
0
votes
4
answers
569
views
Is it needed to increase the precision of ContourPlot in this case?
I have this function and I want to see where it is zero.
$$\frac{1}{16} \left(\sinh (\pi x) \left(64 \left(x^2-4\right) \cosh \left(\frac{2 \pi x}{3}\right) \cos (y)+\left(x^2+4\right)^2+256 x \sinh ...
user73733
0
votes
3
answers
53
views
Low precision from function returning matrix
Got a function depending on single parameter "t" defined below which
returns a 2 by 2 matrix
...
- 345
0
votes
1
answer
44
views
Precision issue using functions
I just want to get a smooth plot but the calculated values are "discrete" which seems to be a precision problem. I tried N[],SetPrecision[],SetAccuary[] without any success. So I paste the Code in its ...
- 3
0
votes
0
answers
101
views
Workaround of non-integer indexed objects? [duplicate]
When using indexed object, I found the behavior of value 0.7 as the index quite strange, then did the following test.
The first output cell was executed directly as the second input cell.
Have not ...
- 804
4
votes
3
answers
3k
views
Permanently rounding numbers/values to a given number of significant figures
I am searching for a simple way of rounding and setting an input to a desired number of significant figures. There are a vast number of posts that discuss similar problems, but none address this issue....
1
vote
1
answer
208
views
User defined functions and decimal places displayed
I have a couple of complicated user-defined functions, one which calls the other, and I wish to control the number of decimal places displayed when I call the "mother" function. I have tried the ...
- 227
4
votes
1
answer
1k
views
Fixed-Point Numbers in Mathematica
I am working with a library that needs input in a Fixed Point notation. I’d like to figure out a way to convert the floating point results into fixed point representation.
The fixed point length is ...
- 1,867
3
votes
1
answer
197
views
Why the EuclideanDistance of these 2 exact points generates the warning N::meprec?
The two points are:
pts = {{1/4 (-1 - Sqrt[5]), Sqrt[5/8 - Sqrt[5]/8]},
{1/4 (-1 - Sqrt[5]), -Sqrt[5/8 - Sqrt[5]/8]}};
EuclideanDistance @@ pts
N::...
- 70.1k