# Yongjian Feng

### MathWorks

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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**Content Feed**

Unable to find explicit solution

This equation might not even have a solution. Try to plot it: syms t b=2*t+14.3; w=3*t+21.45; A=(w*b)-(w-t)*(b-2*t); rc=(w*...

circa 16 ore ago | 0

unable to get matlab to recognize the python installed on my computer

python on Windows might be tricky. Did you follow this page? Maybe you need to setup your PATH environment variable first?

circa 23 ore ago | 1

| accepted

Issues Using python from MATLAB

python has trouble to find the package selenium. One easy way out is to set the environment variable PYTHONPATH inside matlab to...

circa 23 ore ago | 0

Call component callback from another function

A callback function in your case is just a method of a class. You called your class file1 apparently. The Save method doesn't de...

2 giorni ago | 1

Bulk upload issue - HTTP Error code 502

You are using python code, but this is a matlab forum, right? In general, three suggestions: Try curl. This can tell if there ...

14 giorni ago | 1

Save a matrix .mat in a specific folder with a variable name

Try something this: a = 100; for i=1:3 file_name = ['filename' num2str(i)]; save(file_name, 'a'); end

16 giorni ago | 0

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c code and makefile to matlab

If you can compile it and run it from terminal, can you just use the system command?

16 giorni ago | 0

Can I see the text of a compiled *.m file?

The folder you mentioned in general is used for caching data locally. Most likely during compilation. This might not happen in t...

circa un mese ago | 0

Plot Time Sensitive Data plus a fit in the same plot

To show more than one plots in a figure, use plot(Date, Thickness, '.'); hold on % this means you want more than one plots in ...

circa un mese ago | 0

Creating MATLAB tests in separate folder/module

Use addpath("your_root_path")

circa un mese ago | 0

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How to write this expression in MatLab

e^x is exp(x) in matlab, and lnx is log(x).

circa un mese ago | 1

How do I subplot figures and Title Figures

Try this: subplot(2, 3, 1); % there are 2x3 images, this is the first one imshow('the_first_image.png'); % show first title...

circa un mese ago | 1

Not enough input arguments

What is confusion.getMatrix? The built-in confusion is a function. There is another confusionmat, but the return arguments don't...

circa 2 mesi ago | 0

I want to make a GUI in which only those functions run whose radio button is on, but how to make it?

Radio buttons or checkboxes? You can have a figure with multiple plots. Say if you have 10 checkboxes, then put 10 plots in th...

circa 2 mesi ago | 0

How can i Calculate this with matlab?

If the series is convergent, one way is to set a cutoff value (for example epsilon = 0.00000001). Then when you do the sum from ...

circa 2 mesi ago | 0

How to change the name of variables inside a file.mat?

How about this? t=100;C=80; % your data save('data.mat', 't','C'); clear; load('data.mat'); %load it first texp=t; Cexp=C...

circa 2 mesi ago | 0

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I don't know how to write the following problem: f(x)=2x^3-15.4x^2+2.7x+2.25 - Determine the area under f(x) on the interval [-1,8]. Use the zeros rounded to one decimal

Area under f(x) basically is just the definite integral of f(x) within the range, right? You know how to use matlab to do inte...

circa 2 mesi ago | 0

I am given an array

Do you mean: a = [3 4 5 3 64 7 6 34 8 5 4 3]; m = mean(a); st = std(a); an = abs(a - m) > st; ind = find(an); a(ind) = an(...

circa 2 mesi ago | 0

Matlab wouldn't find simple inverse

The inverse function is not well defined for all the possible a. For example a=1, there is no reverse function. If a is an o...

circa 2 mesi ago | 1

Summing every nth column

Your logic is not consistent. from 1 to 300, there are 298 rows in between. But from 300 to 600, there are 299 rows in between. ...

circa 2 mesi ago | 0

Looking for simulation folder of the work showed in attached link

You see the 'Copy Command' button on the top right corner? It is a shortcut for this command power_motordrive_IPMSM_FOC It wil...

circa 2 mesi ago | 0

Change working directory to where the mlx file is saved

If that folder is in the matlab's path, you can which your_mlx_file.mlx

circa 2 mesi ago | 0

Write in column of matrix

Left hand side A is a matrix, but right hand side also an A as a array? Also left hand side shall be A(:, 1) Try this: A = z...

circa 2 mesi ago | 0

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Dijkstra algoritm coding on multileg itineraries

Dijkstra algorithm actually gives you the seudo-code of the implementation. Just need to translate that seudo-code into matlab. ...

circa 2 mesi ago | 0

| accepted

Why am I getting "too many output arguments" when I am Quantizing an input speech?

It looks like quantize only returns one output, not 3 help quantize

circa 2 mesi ago | 0

How to append image from UIAxes of App designer to the report generating using mlreportgen?

Assuming you are talking about matlab report, this reference talks about how to add a figure into the report.

circa 2 mesi ago | 0

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how do I show the images name on top of each picture

Add a title to each subplot, after you call subplot: title('Horse')

circa 2 mesi ago | 0

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How to use context menu for app designer

Each listbox has its own contextmenu, right? You should be able to tell which listbox is calling, right? Attach a screenshot i...

circa 2 mesi ago | 0