J. Alex Lee

Last seen: 1 month ago | Active since 2016

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plot every column in an excel sheet and the corresponding column in the second sheet in same box plot with header name as chart title.
T1 = readtable("example.xlsx","Sheet","TF off TS","NumHeaderLines",1); T2 = readtable("example.xlsx","Sheet","No twist free off...

5 months ago | 0

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Markers on UIAxes in App Designer
you probably need to issue plot commands specifying "parent" as the app.UIAxes

5 months ago | 0

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Solution of Fick's Second Law of Diffusion Equation
I agree with the general idea in Torsten's answer using FD and method of lines. Specifically what ode solver to use on the discr...

5 months ago | 1

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Detect when UIfigure is open
the best i have been able to do is to not use appdesigner itself to create ui components and start the app very bare bones so th...

5 months ago | 0

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Plot Stiffness of Unidirectional Composite in Polar Coordinate System
theta and rho are respectively angle and radius...so for example t = linspace(0,2*pi,500)'; r = cos(t).^4 + .5; polarplot(t,r...

5 months ago | 0

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Slower program due to an additional figure window
I think your issue is that call to getframe() needs app.UIAxes to be supplied, that is, getframe(app.UIAxes) otherwise it wil...

5 months ago | 0

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Filled contour with whiteout regions based on xyz data
If you can tolerate manually identifying white-out regions (just by a single set of coordinates somewhere in the region, such as...

5 months ago | 1

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Curvature of a 2D image
The calculation of arc length and curvature using arc length parameterization and its derivatives, given "perfect coordinates", ...

6 months ago | 0

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How to group statistics by 2 variables for plotting?
are you looking for something like this? load("VolcRegion_clust.mat") T = cell2table(VolcType_clust,"VariableNames",["Region...

7 months ago | 1

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Increasing speed by fixing axis and grid outside of a loop
I think what Torsten is getting after is: do you intend to keep the history of all the previous pairs you plotted? But I'm goin...

7 months ago | 0

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morphing a surface over 3D data
It's hard to give specific ideas without knowing the shape, but... "The final goal is to obtain a triangulated surface that con...

7 months ago | 0

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how to remove jumps?
Are you looking at the diff() of the signals? Maybe you can find the locations of the jumps as where the largest absolute value ...

7 months ago | 0

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How to draw a ball by plot3?
like this? but it doesn't use plot3 [x,y,z] = sphere(64); p = surf(x,y,z,"FaceColor","interp","EdgeColor","none"); p.CData = ...

7 months ago | 0

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条件ごとに計算させるにはどうすればよいか
Gomen, kana tukaemasen. mask ni kanshiteha "logical indexing" wo search shitemitekudasai: link @(x)fun ni kanshiteha "anonymou...

7 months ago | 2

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条件ごとに計算させるにはどうすればよいか
Do you know about the function "atan2", which might be helpful M1 = readmatrix("tmp.txt"); tc = 1/1000000; % no need to...

7 months ago | 2

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Using readtable (or similar) to import multiple ranges of data
it's hard to say without seeing the csv file, but it sounds like the data is not really tabular, and you may be better off using...

7 months ago | 0

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I want to store tables in a for loop to excel
Assuming the columns in the table are always the same, and you generate multiple versions of a table in the loop, and want to sa...

8 months ago | 0

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How to combine group of plots into one with separate marker
Assuming that each figure only has 1 axes and you want the first axes to be the one you want to copy into fig(1) = open('f1.fig...

8 months ago | 0

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enable/disable menu next to radiobuttons when those are selected/deselected
You are hiding how you created the radio buttons in the gui creation, but a big question is whether when you say "2 button group...

8 months ago | 0

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How to select rows in a table containing both string and numbers?
Look up how to index tables, and ismember. % your table name: modal_displacements % extract the columns of interest, if you ...

8 months ago | 1

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Undefined function 'isnan' for input arguments of type 'Nodes2'
For reference, a related question that shows more of the actual classes in question: https://www.mathworks.com/matlabcentral/ans...

8 months ago | 1

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appdesigner, choosing from dropdown different functions
I suspect your problem is that your conditional is flawed. To test, put in an "else" to check if your conditional is not being m...

8 months ago | 0

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Shift a curve in logarithmic scale
shifting in log scale is actually a multiplication, not an addition - is that what you need?

8 months ago | 0

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How to trasform from cell to matrix and transpose from horizontal to vertical at the same time?
Just change your cat dimension to 1, then transpose later. Data.my_cell = {rand(1,101);rand(1,101);rand(1,101)} m = cat(1,Data...

8 months ago | 1

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Can I change my UIFigure size while maintaining location of elements in figure?
I think you may be able to achieve what you want using the uigridlayout, see if this example works on 2019b (I'm on 2022a). The...

9 months ago | 0

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Heatmap is too Thin in Figure
imshow() asserts 1:1 aspect ratio to show the image, so you can manually change the axes Position property after setting DataAsp...

9 months ago | 0

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Implementing Crank Nicholson in spherical setting
I believe this should be the right formulation for CN (taking a few liberties interpreting your problem). If you want speed, pr...

1 year ago | 2

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Implementing Crank Nicholson in spherical setting
For one thing, your boundary conditions (as developed on your pdf) don't look right. At r=0, you can just directly use Eq 8 LHS...

1 year ago | 1

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Built in look-up style interpolation of timetables for non-numeric data?
Is there no built-in function similar to interp1 for numeric data, that can operate on timetables with arbitrary data types? So...

1 year ago | 1 answer | 0

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For loop to carry value down depending on another matrix value
In your example, there is a "delay" by 1 row when your switch from 0 to -1 occurs, so the following answer is not exactly produc...

1 year ago | 0

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J. Alex Lee

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