# Questions tagged [numerics]

Questions on the numerical functions of Mathematica, implementing numerical methods and numerical computing with Mathematica.

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### Numerical integration of MeijerG function with variables

I applied the integration, How to solve the function which is mentioned below. here, 'theta' is the only variable. q13, q1,q2,p,qi1 are all variables will take value from the loop ranges from 0 to 2, ...
49 views

### Evaluate function at “good” points used by Plot in numerical problems

Plot function with option Mesh->All shows how mathematica evaluates function to make it most optimal for plotting. I'd like to evaluate some physical function in ...
120 views

### Using functions instead of lists in physics numerical problems

I'm using the following code for calculation of reflection and transmission coefficients through square well potential: ...
235 views

### Some Strange results from MMA and Matlab

Recently I am repeating a numerical discrete Fourier transform. Since this problem is related to a real experiment. So the authors use some complex functions to fit the results. Below formula is the ...
37 views

### NDSolve and Explicit Runge-Kutta method [duplicate]

Welcome all, I have a comment to explain how my system solver. My response was to add ...
39 views

### How to read Z == 0. - 0.00162663 W

I am solving a set of three linear equations with four variables and found out the values of X, Y and ...
5k views

### Mathematica vs. MATLAB philosophy [closed]

During a typical (possibly with alcohol mixed) discussion among some academic peers in regards to numeric calculation and general modern use of computers in science and engineering settings, it become ...
170 views

### Time dependent delay differential equation

The command NDSolve is really good at solving delay differential equations. $$x'(t)=x(t)(1-x(t-d))$$ ...
79 views

### Root finding: Is there no bisection method root finder?

I am trying to find a root to an equation f[k,...]==0 numerically, where k is the variable I am solving for. Using both NSove as ...
97 views

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

Let me show the code first. ...
111 views

42 views

### Division by a series with no coefficients

I know it is strange, but it seems MA is unable to compute a simple series expansion ...
334 views

### How can I compute Erf of large numbers to more precision?

I would like to compute Erf[80/3] to enough precision to know the order of magnitude of 1 - Erf[80/3] How can I do that? I ...
29 views

### Find at least one distribution with given parameters [closed]

There is a continuous probability distribution that I have only limited information about. I know that its PDF is a smooth unimodal function with exactly $2$ inflection points; I also know numeric ...
105 views

### Solve free boundary problem for heat equation

How can I use Mathematica to compute/approximate and plot the solution of the following problem? $\min\{u_t - u_{xx} -1, u \} = 0 \text{ in } (0,T)\times (-1,1)$ $u(0,\cdot) = 0 \text{ in } (-1,1)$...
86 views

### How to prevent this overflow error?

I compiled the following Mathematica code ...
100 views

### Can I impose some a priori constraints on a distribution found by SmoothKernelDistribution?

I use SmoothKernelDistribution (with no options and a single argument — a list of values) to get an approximate reconstruction of a continuous distribution based on ...
58 views

### NArgMax plotting partially wrong solution

In the following MWE, NArgMax finds the correct argmax (br1) as a function of the parameter ...
600 views

### Why does NMaximize miss this global maximum?

I am having trouble maximizing a function which appears as a curvature of a planar curve. ...
63 views

### Numerical evaluation expression not returning result in requested precision

I have a long list of descriptive statistical quantities for a univariate list of data. The problem is that the set number of significant figures is ignored by the ...
84 views

### Global optimisation - Error bound on NMaximize?

Is it possible to obtain an error bound on NMaximize? e.g. convert the number returned by NMaximize into a rigorous upper bound ...
67 views

### RegionBounds wrong with small change

For the following: RegionBounds[ImplicitRegion[0 <= y <= Sqrt[1 - x^2], {x, y}]] I get the correct value of ...
31 views

### How to get the output for the following code involving differentiation and integration?

I need to evaluate the following Mathematica code to get a numerical value as my output. But during compilation I get the error message NumericalMath`FixedPrecisionEvaluate::precbd: Requested ...
47 views

### How to stop the result?

My program allows me to solve the equation Ht. The aim is to show the probability for each value of d value in my dlist table (dmin and dmax). But, for certain values ​​of d, I have a first negative ...