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ma Jack


Last seen: 8 days ago |  Active since 2022

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Hello, can MATLAB solve equations like the one below? I mean, can MATLAB find the conditions for z that satisfy this relationship, instead of just numerical solutions?

9 days ago | 2 answers | 0

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answers

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Hello everyone, I have a non-Hermitian matrix, but I find that even using vpa, I cannot obtain the correct eigenvalues. Does anyone know how to resolve this?
Below are my code and .mat data. The green circles represent the correct eigenvalue range for the non-Hermitian mat...

19 days ago | 0 answers | 1

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answers

Question


Hello everyone, I have a question about numerical integration. The formula is shown below, where the integration path C_beta is a closed curve on the complex plane.
It’s important to note that the integration path C_\beta is not an analytical expression; it is a set of complex numbers o...

25 days ago | 2 answers | 0

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answers

Question


How can I make the following heatmap smoother while preserving the contours outlined by the green line?
Hello everyone, I'm a beginner in MATLAB image processing. I currently have the following heatmap, and as you can see, its resol...

28 days ago | 3 answers | 0

3

answers

Question


How can I adjust the settings so that the following heatmap retains most of the details?
How can we make the smaller values in a matrix more visible on a heatmap, without removing the large values, when the colorbar s...

1 month ago | 1 answer | 0

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answer

Question


Can MATLAB plot a graph like this? (Ignore the black lines and light blue areas; I only care about the red and blue points.)
Hello everyone, I want to plot the image below. Please ignore the other parts; I'm mainly focused on the red and blue ...

2 months ago | 2 answers | 0

2

answers

Question


Questions about infinity in matlab
Hi all， In matlab it seems that as long as a number is greater than 1e309 it will be considered inf,but my calculations tend...

2 years ago | 3 answers | 0

3

answers

Question


Hi all,I want to enlarge the white border of a picture (not crop the white border, mind you), what command or code should I use?
Note in this image that the symbol 'Y' is clearly cut off a little and the distance between it and the edge is clearly not the...

2 years ago | 1 answer | 0

1

answer

Question


How to quickly calculate the following function？
Hi all,I want to calculate the function shown below: This is Lerch transcendent function( https://en.wikipedia.org/wiki/Lerch...

2 years ago | 1 answer | 1

1

answer

Question


Hi all,I want to use matlab to calculate the exponential integral,I know that the official function ExpIntegralE in Mathematica can calculate it.
As shown in the title, I want to find a relatively authoritative code to calculate exponential integral

2 years ago | 2 answers | 0

2

answers

Question


How does matlab draw the following image？
Note that the basic geometric elements inside are spheres, cones and small cylinders, and that the known data are the ...

2 years ago | 1 answer | 0

1

answer

Answered
A really, really strange situation (the same two copies of code on the same computer with the same version of matlab running at very different times)
Sorry, please give me some time to double check my formulas, I found some parts of my formulas that don't seem to match ...

2 years ago | 0

Question


A really, really strange situation (the same two copies of code on the same computer with the same version of matlab running at very different times)
The same two copies of code on the same computer with the same version of matlab running at very different times！ Th...

2 years ago | 4 answers | 0

4

answers

Question


How does matlab go about drawing an image like the one below？
Hi all, I recently wanted to draw a graphic (below, this is a simple example I drew using PPT): It consists of a black ...

2 years ago | 1 answer | 0

1

answer

Question


How to avoid using det, when looking for the complex root w with det(M(w)) = 0
Hi all, I want to find a complex number w such that det(M(w)) converges to 0 (note that M is a matrix and it is a function...

2 years ago | 1 answer | 0

1

answer

Question


A strange case (different CPU but same matlab version, different calculated results)
Hi all, Have there anyone encountered such a strange situation? Different CPUs calculate different results, I mean "0" v...

2 years ago | 0 answers | 0

0

answers

Question


Questions about the parfor function
Hi all, Is there a way to make the parfor function faster here? My cpu has six physical cores, but it is 12 threads, ev...

2 years ago | 1 answer | 0

1

answer

Question


Questions about the Lsqnonlin function
2022/7/2 Hi all, Are there any experts here who use the Lsqnonlin function?I'm trying to use the Lsqnonlin function to...

2 years ago | 1 answer | 0

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