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J. Alex Lee


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189 total contributions since 2016

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Answered
Number of button groups in GUI depending on user input?
I would question the premise... How about having a listbox that lists each measurement, and only a single button group, whose c...

3 days ago | 0

Answered
Fit height uitable App Designer
it wouldn't work with the "fit" gridlayout, but if it is really important to you, what i have done in the past is to measure the...

4 days ago | 0

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Answered
Fit height uitable App Designer
Look into uigridlayout with the "fit" keyword for row heights

7 days ago | 0

Answered
How can I plot this type of figures?
Using surf, did you take these steps? L = membrane(3); surf(L,"LineStyle","none") % don't display mesh view(2) % view from to...

7 days ago | 0

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Answered
Dataflow in App Designer
Yes, much clearer explanation of your question. All due respect to Sourabh, I do not think you are looking for multi-window app...

14 days ago | 0

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Newton's method for minimisation returns a critical point
Yes this looks normal, you are only asking to zero the gradient of the function, so naturally that includes non-optimal points w...

24 days ago | 0

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Search function in drop down menu in AppDesigner?
Just confirmed, if you set the "Editable" property of a uidropdown to "on", you get some simple filtering of the Items based on ...

1 month ago | 0

Answered
MATLAB App Designer hold on/off throwing warnings
I would set the "NextPlot" property of the polar axes to "add". pax.NextPlot = 'add';

1 month ago | 0

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Answered
Finding strings in a cell array that start with a specific substring
Try this A = {'test' 'hello' 'world' 'st1' 'st2' 'st99'} matches = regexp(A,'^st\d+$','match') B = [matches{:}]

1 month ago | 0

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Answered
How to plot sphere in sphere coordinates?
Your problem is not with conversion or plotting, but defining the coordinates that you want... [phi,theta] = meshgrid(linspace(...

2 months ago | 0

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Answered
fit curve with parameter
If i understand Rik correctly, I think you'd first have to estimate the t data by computing the cumulative arc length between yo...

2 months ago | 0

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Answered
how to "convert" user inputted letter and number combination to a row,col position on a plot?
In case you want to make battlship on an insanely large grid, here's a more general solution to convert "Excel column" style lab...

2 months ago | 0

Answered
Plotting into Multiple Axes in GUI
Any plot command can accept as a first argument a target axes object to plot into.

2 months ago | 0

Answered
How do I pass a variable number of outputs through two functions?
Currently your GetData function literally has no purpose other than to alias the function you want with other names...the mechan...

2 months ago | 0

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Answered
minify Matlab code (minimize number of characters)
Partial answer to implement Rik's original stripping of blank lines and full comment lines, and also attempt to squeeze the line...

2 months ago | 1

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Animating a pointmass sliding down a plane
There's some inconsistency in whether you are treating the angle from vertical or horizontal (effectively). It may also be conce...

2 months ago | 0

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Answered
How to solve system of nonlinear ODEs with "unusual" boundary conditions?
If you are talking about boundary value problems versus initial value problems, look at bvp4c and bvp5c. There is nothing "unusu...

2 months ago | 0

Answered
Euler's Method/Improved Euler's Method
The error is telling you that at the first step of your loop (n=1), you are trying to access the n=2nd element of t and y, but a...

2 months ago | 0

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set uiaxes in matlab function as current figure to plot on
I would argue that it makes more sense (more elegant) to require specifying the parent axes to plot. The way that you want may c...

2 months ago | 0

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Answered
How to solve unknown coefficients for an exponential fit equation iteratively?
MattJ's answer takes y0 to be known, which Yi Jiao clarified is not the case. Treating y0 unknown and extending MattJ's answer l...

2 months ago | 0

Answered
Is there a simpler or more efficient way to do the following?
You could for example do this function B = label1(A) [rows,cols] = size(A); B = ["",string(1:cols);[string((1:rows)')+char(9)...

2 months ago | 0

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Answered
How to filter a structure based on part of nested field names
It's not 100% clear where you are stuck, but it sounds like knowing about "fieldnames()" will help. For data structure design, ...

2 months ago | 1

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Answered
Simulate image data representative of a real experiment
Bjorn's answer contains the conv2() route to blurring fK = exp(-X.^2/dx^2-Y.^2/dy^2); fK = fK/sum(fK(:)); Im = conv(full(dIm)...

2 months ago | 0

Answered
deconvolution of impedance spectra
the deconvolution operation is denoted "deconv" in base matlab. whether this is what you are looking for is unclear from your qu...

2 months ago | 0

Answered
Caclulate Horizonzal Area Between Two Curves And Minimize This Area (Optimization Problem)
Take a look at this: clc; close all; clear; % it looks like these are ultimately the curves you want to compare f1 = @(x)...

2 months ago | 1

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Answered
Appropriate Weights in Exponential Fit
The choice of weighting is unrelated to the computing platform... If you want to use an inverse variance weighting strategy, to...

2 months ago | 0

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How to speed up the simulation time of a big system of ODEs?
don't use syms

3 months ago | 0

Answered
Indexing arrays of binned data
From what I can gather, it hsould be possible to reorganize your experimental data into a Nx6 matrix called Data, where N is the...

3 months ago | 0

Answered
regression line in quadratic form
[edited] Alternatively, just create a new variable to hold an already sorted "model" experience N = 200; % choose an arbitrary ...

3 months ago | 1

Answered
Reading large excel file using "read" command takes ~5 minutes, is this expected performance?
Try manually creating the import options with spreadsheetimportoptions().

3 months ago | 0

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