Yongjian Feng

MathWorks

Last seen: Today | Active since 2021

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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Answered
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)

18 hours ago | 0

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Finding the last value of a difference equation
Use: y(end) = -3

18 hours ago | 0

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

3 days ago | 0

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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;...

4 days ago | 0

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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...

5 days ago | 0

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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?

5 days ago | 0

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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...

5 days ago | 0

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Answered
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...

5 days ago | 0

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How to store graphs (undirected) i cell array and retrieve them
You meant: graphCellArray = {g1, g2, g3}; graphCellArray{1} % access the first one

5 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....

5 days ago | 0

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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 ...

5 days ago | 0

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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*...

5 days ago | 0

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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?

6 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...

6 days ago | 0

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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...

7 days ago | 1

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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 ...

19 days ago | 1

Answered
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

21 days ago | 0

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Answered
c code and makefile to matlab
If you can compile it and run it from terminal, can you just use the system command?

21 days ago | 0

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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

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Working with fortran Mex files on Mac OS
Try this answer.

1 month ago | 0

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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

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Creating MATLAB tests in separate folder/module
Use addpath("your_root_path")

2 months ago | 0

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Answered
How to write this expression in MatLab
e^x is exp(x) in matlab, and lnx is log(x).

2 months ago | 1

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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

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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

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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

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Turn a two dimensional vector into an array
Check this command?

2 months ago | 0

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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

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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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Answered
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...

2 months ago | 0