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# Paul Hoffrichter

##### Last seen: 2 days ago
96 total contributions since 2020

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Keep a temporary variable after parfor
>> Parfor loop works when i comment out the plotting parts of the code. I tried what you said and only experienced what you wro...

4 days ago | 0

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how to fix Warning: Imaginary parts of complex X and/or Y arguments ignored
If you have a negative number raised to a non-integer power, you can sometimes get a complex number. Take a look at: https://ww...

10 days ago | 0

Solving a simple equation
Sorry, no idea if this is right. clc, clearvars %Angle = B %Thickness = u %Inner Radius = p %Developed length = L %L = L1+...

10 days ago | 0

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Question

Convert near zero complex parts to 0
In R2020a, I took a complex vector and converted near zero parts to zero. It took two long lines to do it. Can it be done in one...

11 days ago | 1 answer | 0

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What am I doing wrong here? I am trying to recreate following highlighted equations in the table.
clc; clear; clf ep = linspace(0,1); m1 = 1.5; m2 = 3.8; ep0= 1; alpha = 0.785; epp = 0.11; qep = (2.76*ep.*cosh((3*ep)-1.92)...

16 days ago | 0

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I am expecting that you will get the following: >> which essai 'essai' not found. Write down the folder where your essai.m fi...

16 days ago | 0

Obtaining the envelope of AM signal using hilbert transform
In general, if you increase the carrier frequency, you will get a better envelope. Specific to your figure, to remove the rippl...

17 days ago | 0

computing vectors with string and numbers (easy question)
Here is code that keeps the indexing scheme based upon the order in which the names occur in your vector of strings. >> S = ["H...

17 days ago | 1

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computing vectors with string and numbers (easy question)
>> S = ["joe" "april" "andrea" "joe" "andrea"] S = 1×5 string array "joe" "april" "andrea" "joe" "andrea" ...

17 days ago | 0

Simulating a drone and bird as radar targets
Sounds like a good project. Personally, I would take a movie of a bird and a drone, and then try to reconstruct a 3D polygon of ...

1 month ago | 0

How to generate a list of random ID which can later be used instead of participant name?
Due to the cyclist remark about homework, I am just starting the script. It leaves out certain patterns like 'a9a9' since it is ...

1 month ago | 0

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Syntax Question, Why does this equal zero?
Good question. :) >> 1 - 7*( sym(8/7) - 1 ) ans = 0 % you are right; the answer is 0 For double numbers, look at the format...

1 month ago | 1

Forcing Page Breaks in MATLAB
The official 2016 answer is here, and no discernible updates since 2016. It would be great if MathWorks would add that to Live E...

1 month ago | 0

how to get the mean for specific rows number of one columns
M = [ ... 1 5 2 7 3 9 1 9 2 7 3 9 ]; T = array2table( M, ... 'VariableNames',{'Month','...

2 months ago | 0

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Vector. Change the way my program gives me the answer.
v = [1 2 -3 4]; v( diff( sign( [v(1) v] ) ) ~= 0 ) ans = -3 4

2 months ago | 1

Vector. Change the way my program gives me the answer.
v = [1 2 -3 4]; n = 1; l = length (v); ii = 1; c = []; while (n < l) a = v(n); b = v(n+1); n = n+1; % if (a <...

2 months ago | 1

Group data in bins
Hope this is close to what you are looking for. EDGES' ans = 0 0.5000 1.0000 1.5000 2.0000 ...

2 months ago | 0

How to solve matrix function in Matlab?
Define Z = AXB + C - X You have to start off with your initial best guess for X based upon the nature of the model. For lack of...

2 months ago | 1

Creating blocks of average values from a series but avoiding dynamic variable names
Since you have 5 groups of 100 numbers, I thought you wanted the mean of each group. That gives 5 means. So I did not understand...

2 months ago | 1

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plot discrete time domain signals
I recommend using following substitutions: plot(t,y) axis( [-1 10 0 1])

2 months ago | 0

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Solved

Longest run of consecutive numbers
Given a vector a, find the number(s) that is/are repeated consecutively most often. For example, if you have a = [1 2 2 2 1 ...

2 months ago

Imbedded If statement in Function help!
Did you know that >> logical(1) + logical(1) ans = 2 and that (age>50) is a logical?

2 months ago | 1

In Online Matlab under App menu, Signal Analyzer not working?
The Signal Analyzer app comes with a purchase of the Signal Processing Toolbox. Please review this short video: Signal Analysi...

2 months ago | 0

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Computer to boost MATLAB operation
As @Jan pointed out, it is very important that you run your profiler to find out where your time is being spent and focus on tho...

2 months ago | 2

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Parfor nested loop Table definition
>> can I at least parallelise the writing of the 4 xlsx tables to speed up the code I do not see how to do that easily without ...

2 months ago | 1

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How to obtain the first and second derivative of the "xt" function
You can use diff function as a crude way to take derivates. But, you should also know that diff introduces noise. Here is an art...

2 months ago | 0

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Computer to boost MATLAB operation
Where is your time being spent - in the nested loop, or in the last loop that is outside the nested loop? If, by "last loop", y...

2 months ago | 0

Giving a moving point a chance to change path every step?
You should just run the script directly. You should not try to call selectPath from the command line.

2 months ago | 1

Giving a moving point a chance to change path every step?
Not sure exactly what you want, but possibly this is getting close. The refactoring should make it easier to modify. % set rand...

2 months ago | 1

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