Linked Questions

10 votes
2 answers

Simplifying the derivative of $|x|$

Context In[855]:= D[Abs[x], x] /. x -> 1 Out[855]= Derivative[1][Abs][1] In[856]:= D[x, x] /. x -> 1 Out[856]= 1 Question Why is ...
user avatar
2 votes
2 answers

Taking the derivative of Re[f]

I have looked at similar posts, such as this one, but none of the solutions have worked for me. I have an imaginary function, and I have tried to obtain its real part using ...
Bravyi's user avatar
  • 21
1 vote
2 answers

Working with complex valued functions

I have a function which has real and imaginary parts and I need to differentiate both parts separately. This is a simpler example of what I have tried, without success: ...
NeonGabu's user avatar
  • 115
4 votes
2 answers

Group delay of a transfer function

I'm trying to find a straightforward way to find the group delay of a transfer function. I've created a transfer function, and through the BodePlot function, I'm able to plot its phase characteristic....
Joao Alberto's user avatar
2 votes
1 answer

Can Mathematica help a theorem to be alive?

We are used to do limits by means of $\epsilon, \delta$. This is the first step an student encounters limits. Using $\epsilon$ and $\delta$ leads him to be familiar to Logic. I have taught limits and ...
Mikasa's user avatar
  • 211
4 votes
0 answers

Strange behaviour of MMA in derivatives of some standard functions

There are some peculiar things to be discovered in derivatives of some standard functions in MMA: Strange behaviour Example 1: Abs We have ...
Dr. Wolfgang Hintze's user avatar
1 vote
1 answer

Getting strange result with derivative of Abs of a complex number

So I am getting some results after a computation like: (-0.741446 - 5.47358 I) Abs'[-0.702207 + 0.0951203 I] The problem is the derivative in ...
Nikolaos Petropoulos's user avatar
0 votes
1 answer

Why is FindRoot failing to evaluate this function? [closed]

I have a (somewhat long) script which runs cleanly until the very last stage. Here, I'm using FindRoot to attempt to parameterize implicit curves in the zero set ...
Benighted's user avatar
  • 1,327
4 votes
0 answers

How to take the second derivative of a complicated function using limits [closed]

I have a very complicated function of one variable consisting of exponential and error functions combined in various ways. Mathematica can't take the derivative of this function in the usual way (...
Mat6554's user avatar
  • 41
1 vote
0 answers

ComplexExpand of Hypergeometric function

I would like to take the derivative of the absolute-squared value of a hypergeometric function and plot the result, for real arguments ...
kotozna's user avatar
  • 319