# Questions tagged [numerical-value]

Question relating numerical representations, operations and methods, including approximate results instead of exact symbolic results.

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### The same formula performed on two different versions of Mathematica yields different results. [Life is so tough]

Let me show the code first. ...
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### Why mathematica does not solve the equation $x\left \lfloor x \right \rfloor=10$ for $x$?

The equation $x\left \lfloor x \right \rfloor=10$ has a real solution, which is $x=\frac{10}{3}$. But when I type Solve[x*Floor[x] == 10, x] a message comes: "...
31 views

### Formula: setting parameters vs replacement, different results?

I have a question that may sound stupid and have an easy answer - but I currently do not see it. I have defined a function of four variables, $f[a,b,c,d]=...$, in what I think is correct Mathematica ...
51 views

### Problem of Encountered non-numerical value for a derivative at t == 0

I try to solve this equation numerically : eq= z''[t] + (2691+ D[Log[Abs[z'[t]^2]],t]) (z'[t]^2 + Abs[z'[t]]^2 ) == 0; By ...
142 views

### Different Methods in NIntegrate

I am trying to numerically calculate a multidimensional integral which involves Jacobi elliptic theta functions. The integrand is the following: ...
51 views

### NumericQ and unknown number of variable in a module-block

I have the following problem I want to address in an elegant way. I have a function of many variables f[x, y, z,...] I want to find the minimum with ...
82 views

### Why does Integrate return an unexpected imaginary solution?

When I calculate the value of the following integral using Integrate, I receive an unexpected imaginary solution. I am using Mathematica 11.3.0. ...
32 views

### Nintegrate providing results much smaller than what is expected

This is the first time I am posting something here. So, apologies if I make any mistake. I am dealing with a numerical integration in Mathematica-11.0 that has a Bessel function in it. In order to ...
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### How do I make InverseBetaRegularized function behave the same in Mathematica 11.3 compared to 11.2?

In Mathematica 11.3: InverseBetaRegularized[0.001, 4501, 500] Never finishes calculating. ...
I've seen similar questions on this site but somehow the solutions there didn't manage to solve my specific problem. I have a function mat1 that takes a square $n \times n$ matrix G, and some final ...