All Questions
21
questions
1
vote
1
answer
86
views
Minimization of an implicitly specified function
exp - an experimental data, where expT - temperature, expChi - magnetic susceptibility
I ...
- 1,883
0
votes
0
answers
92
views
Why doesn't NMinimize work with NSolve?
Why does NMinimize throw the error and how to fix it?
...
- 1,883
0
votes
0
answers
49
views
Optimization problem with complex and real values
I have the following optimization problem:
$\underset{{{a}_{1}},...,{{a}_{m}}}{\mathop{\max }}\,\parallel \sum\limits_{n=1}^{N}{{{a}_{n}}}{{\varpi }_{n}}{{e}^{j{{\theta }_{n}}}}{{\varphi }_{n}}{{\...
0
votes
1
answer
90
views
Real valued solution
I want to obtain the critical points or if you like a real solution for the first derivative of the function set to zero, and the second derivative also vanishes of the function :
...
1
vote
1
answer
132
views
Find the maximum of a given function
I calculate a target function f about two variates a and b.
...
- 135
0
votes
0
answers
107
views
Simplification of long trigonometric expression taking a long time
I have tried to Simplify as well as FullSimplify a long trigonometric expression to get a simplified form of the expression but it takes a very long time almost hours and sometimes it also shows error ...
- 135
0
votes
2
answers
220
views
Is it possible to calculate the desired area analytically?
I have the three two-variable curves $f,g,h$ with $0\leq x\leq \frac {\pi}{2} $ and $0 \leq y \leq \pi$
I use ContourPlot as
...
user80186
2
votes
0
answers
59
views
How to find the regions for which the derivative of my function changes sign?
I have an energy function of the angles of the electrons' spins. th1 is vector with (2l+2) elements and each element represents the angle of an individual electron spin. I need to eventually find the ...
0
votes
0
answers
39
views
Assume some expression is false
I need to Reduce a complicated function and I want to exclude some conditions A and B. How do I assume that the expression A is ...
- 123
0
votes
2
answers
85
views
Plot Parametric f(x), inverse f(x) and f'(x) and then f(x)/f'(x) and inversef'(x)/inversef(x)
I want to plot f(x), inverse f(x) and f'(x) and then f(x)/f'(x) and inversef'(x)/inversef(x)
f[x_] := 2 a ArcTanh[(# a)/Sqrt[-1 + #^2 b]] + a Log[1 + #^2 (a^2 - b)] - 2 Log[# b + Sqrt[-1 + #^2 b]] &...
- 143
0
votes
1
answer
109
views
FindMinimum for a large range
I have a function functionSL[0.01,zl,zh] where I want to find at which zl its minimum value occurs for each different ...
- 715
0
votes
0
answers
175
views
Problem in solving system of equations using "Solve"
I have an equation in its normalized form as:
$\frac{v(x)}{V_{cc}}=C_1\cos qx+C_2\sin qx+1+ \frac{q^2}{1-q^2}.\frac{V_R}
{V_{cc}}\sin (x+\phi)$
Where
$$q=\frac{1}{\omega\sqrt{LC}}$$
With the ...
- 1
0
votes
1
answer
174
views
FindMinimum giving wrong answer [closed]
I have a very simple problem that Mathematica is giving a wrong answer to. I want to minimize the following function:
$\frac{3+t^2+6\theta +3 \theta^2}{6 t^3}$ in $\theta$ and $t$.
Now, plotting the ...
- 343
0
votes
0
answers
132
views
How to involve more cpu cores?
I'm working on Mathematica 11 (Lenovo Laptop, Core i7 cpu, 16GB Ram, SSD storage, windows 10 pro), part of my work is definite double integral, the evaluation time of this integral takes between 50 to ...
user59148
3
votes
2
answers
153
views
Maximising a function by finding roots of the derivative is too slow
I have the function r11[t,k] defined as follows
...
- 371