# Chris

You know how you can sort of see a flashlight through your hand? Red and near-IR photons scatter throughout the tissue and are infrequently absorbed. I study how to use that effect to measure tissue health. Pic not really related.

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Python, C, MATLAB

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**Content Feed**

How to export 3D sphere at stl format

You need a triangulation. stlwrite only works with triangles (vs tetrahedrons), which maybe has to do with an stl only defining...

3 days ago | 0

Exempting imaginary numbers from the output of an expression using an if statement.

You can take the absolute value of each difference: AT = sqrt(s.*abs(s-a).*abs(s-b).*abs(s-c));

5 days ago | 0

| accepted

Question

How should I control label behavior when enabling/disabling elements in app designer?

I've attached a simple app wherein one listbox is disabled by default. In design view, this grays out the label text, as if gray...

5 days ago | 1 answer | 0

### 1

answerSplitting table field with multiple rows into separate columns

Whoops. It looks like each array in Data is a cell, so you'll need to drill down a bit. To repack the first cell: load('Data.ma...

7 months ago | 0

Splitting table field with multiple rows into separate columns

How about: T = rows2vars(Data); T(:,1) = []; Or, if you really only want the first three: T = table(Data{1,1},Data{2,1},Data...

7 months ago | 0

Fast calculation of distances between two large arrays

This should be a little bit quicker (my computer indicates ten hours). tol = 0.5; M = rand(1113486,2); N = rand(1960000,2); ...

8 months ago | 0

| accepted

Plot length of time between two events

Without your code, it's difficult to say what is "easier." Errorbar plots are pretty simple. You could use patch... % My table...

8 months ago | 0

| accepted

Simple query: how can I remove radial axes (eliminate the "spokes") on a Compass Plot

I think the developers of these functions don't intend for us to be messing with the grids, or haven't gotten around to making i...

9 months ago | 0

| accepted

I'm having a problem averaging multiple curves using interp1

You take the mean and max of the U values; I believe you want the I values instead. You have plenty of data points, so the defa...

9 months ago | 0

| accepted

Logical Indexing With LinSpace Issues

This looks like a problem of computer precision. Double-precision floating point numbers in matlab (and floating-point numbers i...

9 months ago | 1

What is the difference between "any" and "all" function?

B = [0 0 0]; [any(B), all(B)] C = [1 1 1]; [any(C), all(C)] A = [0 1 0]; [any(A), all(A)] If any elements are true, any is...

10 months ago | 1

Unable to install matlab as it shows error unable to launch matlabWindow application

I would recommend using a Supported OS, probably with Gnome or KDE. If you insist on torturing yourself, start by reading the M...

10 months ago | 1

| accepted

I would like to modify the equation to calculate total reflection coefficient for N multilayer structure

You could start with an approach like this (numbers are made up): ep = [1 3.9 12 1].'; % The apostrophe transposes the array t...

10 months ago | 0

set range in plot interactively

Attached is a basic app made hastily in App Designer. There are UI elements including a UIAxes for plotting, and callbacks att...

10 months ago | 0

Unable to perform assignment because the left and right sides have a different number of elements.

You've hit the end of the file. The file has 10001 data-containing lines. Your code errors at ii==11, jj==2. block_size (1000...

10 months ago | 2

Starting the AddOn Manager from the command line

I've just run across the Matlab Package Manager, though I'm not sure it would be helpful for your case either. MPM

10 months ago | 0

how to rotate image using function notation

If you're using imwarp, you might as well use imrotate, no? You'd be using the function imrotate() to rotate an image, if that's...

10 months ago | 2

| accepted

How do I input a table column of values into a formula?

The problem, as pointed out by Stephen, is that you are accessing the table data with parantheses, which creates another table. ...

10 months ago | 0

| accepted

Question regarding how to make a game similar to snake in MATLAB.

You could introduce a "grow" bit for each snake. Set it to false initially. grow = false; If a snake collides with an apple, s...

10 months ago | 0

| accepted

Calling matlab.engine.connect_matlab() twice freezes Python

names = matlab.engine.find_matlab() if 'MY_SESSION' in names: eng = matlab.engine.connect_matlab('MY_SESSION') You can de...

10 months ago | 0

Converting an array slicer to Python

Here's a demonstration. import numpy as np lo = -200 hi = 20 x = np.ones((27000,1)) udata = np.ones((27000,10)) columnMa...

10 months ago | 0

| accepted

How to merge and slice arrays of different sizes?

Perhaps you'd be better off with a cell array. ydata = randi(9,1,8) ydata = num2cell(ydata) udata = num2cell(randi(9,1,8)) u...

10 months ago | 0

disp(‘hello world’);

disp ('hello world'); Your apostrophes are wrong. How did you generate them? Here is your version: disp (‘hello world’); You ...

10 months ago | 0

Solved

expand intervals vol.2

Similar to problem <http://www.mathworks.co.uk/matlabcentral/cody/problems/2528 2528>. This is a more general case, when bounds ...

10 months ago

Solved

expand intervals

You're given a row vector of an even number of monotonically increasing integers. Each pair of consecutive integers is the lower...

10 months ago

Solved

Length of a short side

Calculate the length of the short side, a, of a right-angled triangle with hypotenuse of length c, and other short side of lengt...

10 months ago

Solved

Doubling elements in a vector

Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] then B = [ 1 1 5 ...

10 months ago

Question

I'd like to plot some points over an image in a dialog.

I want to be able to select one point with a left-click, a second point with a right-click, but I'm running into all sorts of tr...

10 months ago | 1 answer | 0

### 1

answerMatlab App Designer get axes name from button click

I would add a tag (under "Identifiers") to the UIAxes. Then: function UIAxesSelectedCallback(app, event) selectedA...

11 months ago | 0

How to do this temporal plot

Here's one way. For importing data, perhaps something like data=transpose(readmatrix('filename.xlsx',Range','A2:N2002')); Empt...

11 months ago | 0

| accepted