# Yongjian Feng

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Animated-Gradient-Descent

Animate gradient descent in 3D plot or 2D contour plot. Visualization. Demonstrate impacts of alpha, starting point, saddle po...

5 days ago | 2 downloads |

Invalid ReqIF file. Error details: Type 'AttributeValueTyped_reference' has not been found in the registry.

Hi Hannah, This ReqIF is not a valid ReqIF. As shown in the error message, one spec-object (a "requirement" in the language of...

6 months ago | 0

MatLab App and requirements linking with Requirements Manager

Hi Mark, There is an alternative here. The logic of your MatLab App can be implemented in m-code, and you can call those m-code...

12 months ago | 1

| accepted

I want the a similar function as slreq.export

Hello Marawan, It is a new feature of R2023a that slreq.export can export to ReqIF. Unfortunately, this is not supported before...

12 months ago | 1

Where did Matlab stores a requirement set (*.slreqx file) dependencies ?

Check if you have something called Swc_MTR*.slmx. Rename it to something else and try again. That is a linkset file. Please n...

1 year ago | 0

| accepted

Requirements Linking from imported excel

Hello Sherif, This is an interesting workflow. Could you please confirm the steps below: Link a requirement to a selected row ...

1 year ago | 0

Why Matlab does not see Python?

matlab uses PATH env var to find python. Your python installation is in a local path. Try this in matlab command line: getenv('...

2 years ago | 1

problem reading HDF5 on s3

In python, you seem to use read_only flag ("r"). Maybe you want to try: H5F.open('https://dandiarchive.s3.amazonaws.com/blobs/5...

2 years ago | 0

Error on loop on multiple ASCII files

File.name only gives you the name of the file, not the path. Try: files=dir('F:\Teamdrive\TEST\**\*.ascii'); numfiles=length(f...

2 years ago | 0

Matlab plot3 line color setting

Separate them: plot3(x1',z1',y1','Color', myGreen); hold on plot3(x2',z2',y2', 'm', x3',z3',y3','b', x4',z4',y4','k');

2 years ago | 0

Problem multiplying exponential function with negative value

Try this: t = -20:1:20; x_t = t.*(exp(-0.15*t)); plot(t, x_t)

2 years ago | 1

Warning: Using only the real component of complex data.

j is the imaginary unit here, so x is complex. stem is not used to plot complex numbers, that is why only the real component is ...

2 years ago | 0

| accepted

Loop calculation and output

You meant this: txtFiles = dir('*.txt') ; l=length(txtFiles); N = l*10 ; Bandsheet = zeros(N,8); PSDSheet1 =zeros(N,16); P...

2 years ago | 0

| accepted

Simulink Requirements Editor Default Format

Hello Nicholas, Currently these two settings can't be controlled by the user. One alternative is to use copy and paste. You c...

2 years ago | 0

RuntimeWarning: Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work warn("Couldn't find ffprobe or avprobe - defaulting to ffprobe, but may not work",

Try this on matlab command line window: getenv('PATH') This will tell you what PATH matlab is using. You might need to restart...

2 years ago | 0

Automatically launching an executable

Looks like a warning from Windows, not from matlab. Try to run matlab as admin.

2 years ago | 0

I need to use Newton's method to solve f(x). Can any one tell me what's wrong of my code and how to improve it.

what i s your dx?

2 years ago | 0

Error using subprocess>_execute_child (line 1311) Python Error: FileNotFoundError: [WinError 2] The system cannot find the file specified

Most of the times, this kind of error can be fixed by setting the env var PYTHONPATH inside matlab. So figure out what file/pa...

2 years ago | 0

how to set x-axis and y-axis of a plot as log scales in bold with latex interpreter?

How about these: ax = gca; ax.XAxis.FontWeight='bold'; ax.XAxis.Scale = 'log';

2 years ago | 0

how to find the nearest value (if a value is already provided) from a given array?

Try this: x=0.61; m=linspace(0,1,9); [a, b] = min(abs(m-x)); m(b)

2 years ago | 0

| accepted

hi i have vector for i and this equation : i= (K1*V+(K2*V^0.5)) and amount of V in known. how can i found K1 and K2?

If I and V are vectors, you can just call solve to do the job: I = [1 2]; V = [3 4]; syms K1 syms K2 eq = I == (K1.*V+(K2.*...

2 years ago | 0

plot from ode45

Too many errors in your code. I tried to clean some, but it still has trouble to figure out what y is: function kk1 clear...

2 years ago | 0

Automatically loading the .mat file

For "automatically loading", you most likely mean generating the file names in a loop? Try this: num_case = 26; files={}; fo...

2 years ago | 0

How do I print one variable from solve() ?

Just do disp(A); disp(B); Or a complete script: syms A syms B primereq = 18 * A - 8 * B == 0; segundaeq = -1 * A - 18 ...

2 years ago | 1

| accepted

Can I take data while setting them

Not sure how useful the command you proposed is. If you create first a=rand(4) and then take 8 of them as a(:,2:3), the rest 8...

2 years ago | 2

| accepted

execute cell content as lines of command in Matlab

Try this first from matlab command line window: pe = pyenv This will tell you what python env is used by your matlab installat...

2 years ago | 0

File selection using uigetfile in an App in appdesigner

uigetfile in general is put in a callback for a button, as mentioned by Michael. The ValueChanged callback of a textbox is not a...

2 years ago | 0

I receive the output "Empty sym: 0-by-1"

Ok, the coefficients are the same for both equations. You basically have A*C_1+B*C_2+C ==0 and A*C_1+B*C2+D ==0. These two stra...

2 years ago | 1

| accepted