# Spencer Chen

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**Content Feed**

Question

Inadvertently activating disabled axes interactions

Hi, I have a problem with plots where I have disabled axtoolbar and default interactions. I have customized mouse click callback...

12 månader ago | 0 answers | 0

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answersQuestion

Using LimitsChangedFcn to sync axes of different x-scales

Trying out the newly added LimitsChangedFcn callback in the XAxis of Axes objects in R2021a. I'm running into callback re-entry ...

ungefär ett år ago | 1 answer | 2

### 1

answerQuestion

Programmatically change UDP Packet Output IP: Desktop Real-Time

Hi, I have a Simulink desktop real-time model that has a Packet Output set up to do UDP. I want to be able to set it up so it i...

mer än 2 år ago | 0 answers | 1

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answersRow combination for repeated values

Now, you were not very clear on your column structure. I understand it as in: A = [date.depth1, date.depth2 .. date.depthNtime,...

mer än 2 år ago | 1

How to generate random matrix of 0 and 1 of distinct rows?

I don't know if there are any. But it's easy to write one for your specific case where you only have 5 columns. That is quite m...

mer än 2 år ago | 0

| accepted

Linking pushbuttons to a callback function

I think the problem may lie in that you have nested your functions such that selectionChanged() is a nested function of AND1(). ...

mer än 2 år ago | 0

R2015a plot problem with ticklabel definition

Well, you have set you ytick labels to: num2str(y2(:), '%0.1f') Maybe you meant? num2str(linspace(-0.8,0.8,5), '%0.1f') Bles...

mer än 2 år ago | 0

Problem while creating a gui and to share variables via assignin

What do you mean by "pass them to other functions"? Do you mean access of variable_1 by plotButtonPushed()? When you set the ca...

mer än 2 år ago | 0

| accepted

Saving values from a for loop into an existing matrix

This might be your problem: for i = num_nd ... This code does not give you a proper for-loop. I'll leave you pondering on the...

mer än 2 år ago | 0

How to generate all possible combinations of audio files?

If you have to use nchoose(), then something like this would work: combinations = nchoosek(SoundNames, 2); for i = 1:size(comb...

mer än 2 år ago | 0

| accepted

How can assign a color channel to an image series?

1) What you want to achieve get is probably something like this: RGBimage=cat(3,grayimage,zeros(size(grayimage),'uint16'),zeros...

mer än 2 år ago | 0

How to extract multiple number data after the same specific string from a .txt file?

Something like this should get you started: txt = fileread('test.txt'); txt = splitlines(txt); for ii = 1:numel(txt) if st...

mer än 2 år ago | 0

| accepted

Taking in 2 array variables, my output variable is a single number rather than an array. Any suggestions to get my output in an array?

I guess you probably want to use the: A ./ B operation instead of the straight divide "/". Also as a recommendation, break ...

mer än 2 år ago | 0

Rename a variable within global (function in function)

Simply assign it to another variable. global evil_global_var; saved_evil_global_val = evil_global_var; evil_global_var = new_...

mer än 2 år ago | 0

| accepted

How to get rid of the 1/f in EEG data?

polyfit() is not for estimating 1/f functions. Something like this is more appopriate: fout = fit(x,y,'(a/x)^b','Lower',[0 0])...

mer än 2 år ago | 0

optimizing my code using vectorization methods or avoiding for loops

I would first use the "profile" function to check which part of the code is actually taking a long time. Then tackle those lines...

mer än 2 år ago | 0

| accepted

how can i solve this problem?

Maybe this will get you started. You already have in your code an example of a for-loop. To put Np into a loop, you can construc...

mer än 2 år ago | 0

How to find conditional unique value in matrix

Maybe this will get you started: ux1 = unique(x(:,1)); % Find your unique order numbers for xx = 1:numel(ux1) idx = x(:...

mer än 2 år ago | 0

How to find the Y Value in a Array and Locate corresponding X Value

You are on the right track. Let's start with: X=find(x1(i)~=x4(i)); Indexing into x1 and x4 is your problem here. Think abou...

mer än 2 år ago | 0

Adi is set to 0 when i = 1

Not sure what you are trying to do with Adi. If you solve the mathematical formula: Adi = ((Vd + 1)-(Vd - 1)/(2*(.1)); Adi = (...

mer än 2 år ago | 0

Force nansum to equal NaN (and not 0)

Try: returnMarket(all(isnan(omega)&isnan(retSize1Value1),2)) = NaN; You need to run all() on dimension 2 instead of dimension ...

mer än 2 år ago | 0

| accepted

Why do i keep getting this error???

It's hard to determine the exact problem with the information you have provided. It would be much better if you had copy and pas...

mer än 2 år ago | 0

Colormap: ColorScale options other than linear and log (power norm, etc)

I do not think there is native Matlab feature to do that. You can convert your data into your desired log function and plot it o...

mer än 2 år ago | 0

create a matrix from matrix with zeros elements

You can create a new matrix of the same size: B = zeros(size(A)); Then assign non-zero data in B. Blessings, Spencer

mer än 2 år ago | 0

Issues with polynomial fit

You are fitting an order-1 polynomial, i.e. linear, so it is a bad fit. Try higher orders. But it looks like a different functio...

mer än 2 år ago | 0

| accepted

set Precision in lsqcurvefit

Check out: doc optimoptions I think something like OptimalityTolerance is what you are looking for. Blessings, Spencer

mer än 2 år ago | 0

Data type conversion help

First of all, assuming that your Rpt_row_sel is a table, then Rpt_row_sel(:,2) will also output a table, which cannot be compare...

mer än 2 år ago | 0

Write cell data to excel or text file in a specific format

I'm afraid that you are not clear enough for me regarding the original format of the data, so I can only guess. If you just wan...

mer än 2 år ago | 0

Plotting Points at Specified Index Values

Let's separate your problem into 2 parts: (1) Plotting problem. (2) Finding location of you Maximum on the xGrid2. I'll start w...

mer än 2 år ago | 0

Index in position 1 exceeds array bounds (must not exceed 1)

Try instead: layl=scanvecs{l}; Note the curly brackets to extracting the content of the cell at the indexed position. Using r...

mer än 2 år ago | 0

| accepted