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Trapezoid rule and simpson rule [duplicate]

I want to create a program which can plot the trapezoid rule and the simpson rule of a given function I need it badly for a class presentation truth been told I´am really bad at programing and I need ...
47 views

How to separate the double columns while reading file

I have a file which has contents of the form 10533 "MENDOZAT " 115.0000 : 1 1.00000 Now I want to separate the words and get it as a list. like ...
48 views

Get around and solve stiff systems using NDSolve, particularly addressing “step size is effectively zero; singularity or stiff system suspected”

I have been trying to solve a non-linear 2nd order ODE varying in r & t with 2 boundary conditions (for ...
94 views

Mysterious Difference in Equation Formulation for NDSolveValue and NDEigensystem

I have taken a standard equation from Mathematica help from here for a stress operator. I have also formulated the equivalent equations from engineering texts. When I compare the two equations Using ...
57 views

What is correct representation for Integrating differential? [closed]

A question was posted to Mathematics.SE asking how to integrate the following integral: $$I=\int_{t_a}^{t_b} \left(\frac{\textrm{d}x}{\textrm{d}t}\right)^2\textrm{d}t$$ I thought I would throw this ...
71 views

integrate over the values in the first quadrant [on hold]

With these formulas I get two slopes. e describes the energy. How can I integrate over the first quadrant for the values of e? ...
107 views

What is the reason that $zz^*$ is not written as $|z|^2$ sometimes?

For a general (complex) number $z$ I sometimes get terms that explicitly writes (for instance) $$2zz^*+|z|^2.$$ I should add that these expressions come from long calculations involving packages ...
66 views

Convert mathematica equation in c++ math expressions

I have written some mathematica-code which allows me to compute some equation in general relativity, which I would like to solve using a C++-program. However, the equations are roughly 1000 characters ...
72 views

90 views

Plot 2 plots together with different y-axis: in version 10 will not plot entire range

I am trying to plot 2 plots together with a common x-axis and different y-axis. I have tried implementing the modules shown in 1 Plot, 2 Scale/Axis however I do not see the full range of data in the ...
85 views