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# Robert

### Royal Institute of Technology

Last seen: 1 year ago Active since 2011

PhD-student working with fiber laser and amplifiers at the Laser Physics group at the Royal Institute of Technology in Stockholm, Sweden.

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How to draw an arrow using non normalized coordinates?
I wanted to do something similar, here's an example that adds a double arrow between the x-values 1 and 5 with y-values 5 in a s...

3 years ago | 1

Question

Remidies for changed values in a vector as a result of fftshift?
Hi, While rewriting a script, I noticed that the sum of a vector changes if ifftshift/fftshift has been carried out. Take the...

5 years ago | 1 answer | 0

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Inconsistent solution from a symbolic equation?
I copied the solutions into mathematica and went through all the terms (which is a lot easier since you can display the equation...

5 years ago | 0

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Inconsistent solution from a symbolic equation?
Hi Steven, Thank you for the reply. I suppose that this function essentially does the same as checking whether aa(1)+aa(2)=0 ...

5 years ago | 0

Question

Inconsistent solution from a symbolic equation?
Hi, I'm solving a system of some rather lengthy equations using the solve function after setting up the equations using symbo...

5 years ago | 4 answers | 0

### 4

Solved

Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

6 years ago

Question

Peculiar behavior regarding matrix operations
Hi, I just discovered something that I found really weird when I was working with some element-wise multiplication and divisi...

6 years ago | 1 answer | 0

### 1

oscillating phases when using fft and ifft
Hi Cindy, The use of fftshift after taking the fft is actually not the correct way of doing it (if you're starting with a fun...

7 years ago | 0

Question

oscillating phases when using fft and ifft
Hi, I noticed that I get oscillations in the phases of the fourier transform of my gaussian function and also in the inverse ...

7 years ago | 2 answers | 0

### 2

Question

All pass filter design trouble
Hi, I´ve constructed a complementary filter that is filtering the difference between two signals. After passage through the com...

11 years ago | 0 answers | 0