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# Joseph Cheng

##### Last seen: 8 dagar ago
623 total contributions since 2014

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Two-dimensional colormap
I'm puzzeled by your first portion and the need for a for loop. unless you have a hold somewhere the images shouldn't be stackin...

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how to know if a char vector contains unwanted characters?
check out the function ismember here is snippet of test code x=["0","1","2","3","4","5","6","7","8","9","."]; y = ["3","3","5"...

How can I splitt up a big matrix into smaller matrises, splitting it up by values on the x-axis
so the main question is whether the ranges for the smaller matrixes are known or need to be detectable. then you can use a for ...

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How can I convert a YCbCr image to 4:2:0
while you're probably not going to implement this in simulink but take a look at https://www.mathworks.com/help/vision/ref/chrom...

How to plot a region in a Matlab plot?
here is quick example of what you can do by putting the regions as an image under the plots: %gen xy spans temps=0:.1:100; ...

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How to set marker groups in one plot?
Here is a snippet of code that should help you out. %Dummy data GroupNo =[1 1 1 2 2 2 3 3 4] A = randi(100,numel(GroupNo),2);...

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multiple folder paths into a loop
to add onto what Mr. Roberson has up there: [a]=dir('B*\sss\ttt\*.txt') you can continue the search by using the wildcard + ex...

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Incorrect use of '=' operator occurs in grey out area of app designer.
I was unable to create it myself but from the looks of it you might have a function or calculation that isn't terminated correct...

Undefined operator '>=' for input arguments of type 'cell'.
you can adust it to take out the cell using cell2mat() function or quick cell indexing using the curly brackets {} can do the tr...

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Previous Value of Numeric Edit Field
I think thats almost what you'd want do have and store prevvalue during during successful calculation. Previousely in GUIDE an...

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How to set a scale in a figure (similiar to Google Maps)
I don't understand what you're doing with that line to check baseline. I'll continue to read that however here is a quick scale...

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Plots combining to produce one single plot
What i see is that you have a hold on and you didn't turn it off or designate a new plotting window/figure. Such athat dependin...

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Making a histogram from a struct
I'm not sure what the rest of your dataset looks like unless you are looking to do a histogram of 7 points. However this snippe...

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Radiation Heat Transfer — View Factors (1)
View factors (aka configuration factors) are utilized in some radiation heat transfer models to estimate heat transfer rates bet...

i got index exceeds matrix dimensions.??
You should put a breakpoint at that line and then check the dimensions of the curs variable. without running your code and with...

mer än ett år ago | 0

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Replotting Data vs. Storing Plots/Images
I think the answer would be dependent on how many points are in each line and the size of the images you're going to be pulling ...

mer än 2 år ago | 0

How to create a checkerboard matrix without inbuilt function.
There are much easier ways to do this than nested for loops, reshape is readily available. if you *must* do it with for loops y...

mer än 2 år ago | 0

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does someone know if it's possible to have popupmenu in inputdlg?
Absolutely you can, however its not as straight forward as inputdlg() or questdlg(). you'll want to look at the example here: ...

mer än 2 år ago | 0

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How can I change the LSBs of consecutive elements of an array?
you could use bitand() a = [23, 255, 67, 89, 45, 90, 34, 12]'; n=3; b = bitand(a ,255-n,'uint8') disp(dec2bin(a)) di...

nästan 3 år ago | 0

import multiple spreadsheats at once (.xlsx files)
well first you'll want to get away from generating variables in that fashion as you'll basically have A400 or more which is hard...

ungefär 3 år ago | 0

Looking for a word in a 2D array
I would take a look at the function strfind(), and lower() or upper(). strfind() will return the starting index value of the ...

ungefär 3 år ago | 0

Project 3D points to a surface
you could try something like this. my curve and fit method is probably different however what you can do is use find() to deter...

ungefär 3 år ago | 1

Can I match data from several find functions?
what you should do is get rid of the find() for each parameter filter. keep it as a logical and then you can directly use the l...

ungefär 3 år ago | 0

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How to average plots that differ in x and y data?
you can do something like x1 = 0:.01:4; x2 = 0:.03:5; x3 = 0:.02:6; y1 = sin(3*pi*x1); y2 = sin(3*pi*x...

ungefär 3 år ago | 0

How to get the central data of a matrix?
you'd use the parameter 'same' in the convolution function x = [0 1 2 3 4 5 4 3 2 1 0] conv(x,[0 1 0],'same') otherwise ...

ungefär 3 år ago | 0

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Change axes limits interactively
you can try something like this, which really depends on how you want the user to input the different limits function uiexa...

ungefär 3 år ago | 1

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error using randi: size inputs must be scalar
you actually want to do for n=1:4 a{n}= randi(10,n)-1; b{n}= randi(10,n)-1; fprintf('n = %d:\n', n)...

ungefär 3 år ago | 0

How can I plot mean +/- 1 standard deviation for every data point in my dataset ?
have you looked up the function errorbar()? it should get you what you'll need

ungefär 3 år ago | 0