# 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**

R2021b is close immediately on macos

What Mac OS are you using? Did you run any previous version of matlab on that machine before? Try to find the log file and se...

ungefär 15 timmar ago | 0

Is applying a binary operator (+,-,*,/) to char arrays supported by MATLAB or just a "trick"

Char array is a vector of chars. So you are basically doing vector operation, right?

ungefär 15 timmar ago | 0

Step Response of Transfer Function

Get help by doing: help tf Basically, you need to expand the denominator given in image into polynomial of s. Then take the co...

ungefär 16 timmar ago | 0

| accepted

What is wrong in line 101?

Your file has no line 101. Only 94 lines in total. Tried some sample input data, and it works without error. What inputs are n...

ungefär 17 timmar ago | 0

How to store graphs (undirected) i cell array and retrieve them

You meant: graphCellArray = {g1, g2, g3}; graphCellArray{1} % access the first one

ungefär 17 timmar ago | 0

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Error using images.internal.getImageFromFile in matlab R2016a

images.internal.getImageFromFile expects the input argument to be string (the filename for the image). But it is something else....

ungefär 17 timmar ago | 0

Using Matlab.engine and installing tensorflow at the same time

So the current hurdle is about installing/importing tensorflow, right? For the Anaconda installing issue, you might get better ...

ungefär 17 timmar ago | 0

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*...

en dag 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?

en dag ago | 1

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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...

en dag 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...

3 dagar 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 ...

15 dagar 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

17 dagar 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?

17 dagar 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...

ungefär en månad 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 ...

ungefär en månad ago | 0

Creating MATLAB tests in separate folder/module

Use addpath("your_root_path")

ungefär en månad 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).

ungefär en månad 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...

ungefär 2 månader 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...

ungefär 2 månader 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...

ungefär 2 månader 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 ...

ungefär 2 månader 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...

ungefär 2 månader 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...

ungefär 2 månader 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(...

ungefär 2 månader 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...

ungefär 2 månader 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. ...

ungefär 2 månader 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...

ungefär 2 månader ago | 0