# Yongjian Feng

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Submitted

Animated-Gradient-Descent

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

3 månader ago | 3 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...

9 månader 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...

ungefär ett år 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...

ungefär ett år 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...

mer än ett år 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 ...

mer än ett år 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('...

mer än 2 år 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...

mer än 2 år ago | 0

Create a permutation of elements in the same position

Just 3 for loops.

mer än 2 år 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...

mer än 2 år 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');

mer än 2 år 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)

mer än 2 år 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 ...

mer än 2 år 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...

mer än 2 år 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...

mer än 2 år 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...

mer än 2 år ago | 0

Automatically launching an executable

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

mer än 2 år 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?

mer än 2 år 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...

mer än 2 år 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';

mer än 2 år 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)

mer än 2 år 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.*...

mer än 2 år 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...

mer än 2 år 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...

mer än 2 år 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 ...

mer än 2 år 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...

mer än 2 år 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...

mer än 2 år 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...

mer än 2 år 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...

mer än 2 år ago | 1

| accepted