# 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**

How to call a function inside other function in a equation?

It depends on whether you need to use B in anywhere else. If B is only used in your function yield, you can put it in the same m...

1 day ago | 0

Sprintf problems while trying to format a directory name followed by a string

Try this: sprintf("\\Mann_Turb\\Seed_%.0f\\class4_10_seed%.0f\\class4_10_seed%.0f_v.bin", 600, 600, 600)

2 days ago | 0

ROS required python packages

Your python installation looks good for ROS. What is the detail of the error message?

4 days ago | 0

Solve equation including parameters dependent on main variable

k shall be a symbol, once you do this before it is used, then this will take care of the dependency of delta and theta. syms k;...

5 days ago | 0

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...

6 days 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?

6 days 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...

6 days ago | 0

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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...

6 days 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

6 days 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....

6 days 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 ...

6 days 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*...

7 days 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?

7 days 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...

7 days 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...

8 days 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 ...

20 days 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

22 days 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?

22 days 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...

1 month 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 ...

2 months ago | 0

Creating MATLAB tests in separate folder/module

Use addpath("your_root_path")

2 months 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).

2 months 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...

2 months 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...

2 months 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...

2 months 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 ...

2 months 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...

2 months ago | 0

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