Community Profile # Yongjian Feng

### MathWorks

Last seen: 1 day ago Active since 2021

Software Engineer of Simulink Requirements team. Part time instructor of Calculus and Statistics. Experienced programmer in C/C++ and python. Mac user.

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How to find time and velocity in second order de.
For a numerical approximation, maybe you can try this. First some background information of Physics here. The first derivative...

1 day ago | 0

Submitted

Animate how Adaline classifies data by lowing cost using gradient descent. Compare three kinds of gradient descents. Calling python script from another python script in MATLAB
Try to add the folder of your mymul_text.py to the PYTHONPATH env. Ref: https://www.mathworks.com/help/matlab/ref/setenv.html...

15 days ago | 0

Submitted

ReqIfUtil
Utility to manipulate ReqIF documents. Change attribute values and add spec-relations

Using app designer that makes a file and then clicking a button in app designer to save it to a location.
Check this: https://www.mathworks.com/help/matlab/ref/uiputfile.html

26 days ago | 0

Generating a design matrix with for loops
Something like this? a = (1: 3); b = (4: 6); c = (7: 9); idx = 1; for i = a for j = b for k = c ...

26 days ago | 0

How to print output to console when using a C Caller Block inside a Simulink model?
If you want to debug, is it easier to attach a debugger directly?

27 days ago | 0

Calculating the projection of a point onto a plane
How about this approach: Orthogonal projection can be thought as the (smallest) distance from this point to the plane. Assume ...

28 days ago | 0

Submitted

Animate gradient descent in 3D plot or 2D contour plot. Visualization. Demonstrate impacts of alpha, starting point, saddle po... How to add the path to a Conda (Python) Environment?

1 month ago | 0

How to add the path to a local python file to be executed by a Matlab script?
Python uses an env var called PYTHONPATH to point to packages/scripts. So inside matlab, you just need to add the path you want ...

1 month ago | 0

Newton's Method to Solve Equation
You need to substitute symbols with values, right? L = 1.0; h = 2.0; T = 3.0; g = 9.8; % substitute ret = subs(Df); % c...

1 month ago | 0

Automatically open new files as they appear in a folder
Implement a background thread that scans the folder?

1 month ago | 0

How can I fix this error and what does mean by should return 1 or two arguments help pls
userFG shall return one or two arguments. You can see that the code tries to call userFG and retrieves two returns. If this call...

1 month ago | 0

How to transfer a series of Word files to pdf files?
matlab doesn't have word2pdf function. Implement your own word2pdf function like below following this link, then you can just f...

1 month ago | 1

Why is my function not working?
You meant: function U = velocity(n,S,H,B) U = sqrt(S)*((B*H/(B+2*H))^(2/3))/n; end

1 month ago | 0

Failed to call python modules due to lack of 'core' in numba
I would recommand the following steps to narrow down the issue: From the error message, it seems like matlab can find numba but...

2 months ago | 0

JAGS 3.4 not recognised as command in MATLAB Win10
It seems like an issue of the PATH env var? Try to set the PATH env var to point to those folders?

2 months ago | 0

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Hooking Matlab Online to a local Python installation?

2 months ago | 0

how to repeat a loop until a condition is met than draw histogramm
Just use a while loop? Try: done = false; while ~done u1=2*rand()-1; u2=2*rand()-1; d=(u1.^2)+(u2.^2); d...

2 months ago | 0

| accepted

Seems like you need to bridge it. Your local PC and Google Colab shall be able to communicate using python, I imagine. Using H...

2 months ago | 0

This is the same as calling matlab from python, right? Can you call it from python first?

2 months ago | 0

Bessel function values using starting values
matlab has built-in function. Compare against it. https://www.mathworks.com/help/matlab/ref/besselj.html

2 months ago | 0

API usage with matlab
Use webread with options. The first hurdle is the authentication. Try this one: auth If you are comfortable with curl, the no...

2 months ago | 0

Why do I receive Not enough input arguments?
Try this: function [SA]=equTriPrismSurfArea(sIn,hIn) for i = 1:5 s1 = sIn(i); h1 = hIn(i); S...

2 months ago | 0

how to use function handles
You don't need varargin function A = function1(n,a,b, c, d) A = n+a+b+c+d; end function A = function2(n,a,b, ~, ~) A = n*...

2 months ago | 0

| accepted

Jump to specific page in matlab multiply times // closing PDF File in Matlab
This is not a matlab issue. If you run those two commands on a terminal, you will see the same behavior. Basically the first c...

2 months ago | 0

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How do I reformat a set of differently formatted dates in to one consistent format?
Check this: https://www.mathworks.com/help/matlab/ref/datestr.html

2 months ago | 0