# Wick

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Question

Bug in triangulation pointLocation calculations?

I have a snippet of code that is a simplifcation of a problem I've found using the pointLocation feature of MATLAB's triangulati...

2 years ago | 1 answer | 1

### 1

answerWhat, if anything, can be done to optimize performance for modern AMD CPU's?

The Accepted Answer by @NedFlanders is the best solution so far. Use that one. But in the comments of that answer, MathWorks s...

5 years ago | 2

Question

Limitation to Hidden Line Removal?

I'm trying to render small objects and large objects together. I'm using the camera commands to restrict my field of view such t...

5 years ago | 0 answers | 0

### 0

answersQuestion

Odd Subplot Behavior - Script interpreter bug?

I've got a script that produces some plots. It's nothing fancy. I haven't included all the variable definitions in the code snip...

6 years ago | 0 answers | 0

### 0

answersHow would you make a contour plot of a 3 column matrix?

This plots the original data, the mesh that interpolates that data, and the contours it creates. If you want it to extrapolate o...

6 years ago | 3

find indices of row subsets

Here you go. At the sizes you suggested, this shouldn't take too long. It has a single 'for' loop that cycles through the unique...

6 years ago | 0

Using logical indexing to get subset of matrix rows which give desired output from function

I'm using random numbers just to have something to work with. The trouble is 'dot' doesn't like when the matrices aren't the sam...

6 years ago | 0

How to find elements of two different matrices that meet multiple conditions and store those values in one matrix?

Logical indexing is your friend. I don't know what your conditions are so I'm just going to make a few conditional statements be...

6 years ago | 0

cannot open vlc from matlab using system command

[status, msg] = system('/usr/bin/vlc test.y4m &') Note the _single quotes_ on either end of the command to be sent to the ...

6 years ago | 0

How to plot a sphere with lines of latitude (constant phi) for a given center (xo, yo, zo) and radius (R)

clearvars R = 1; xo = 10; yo = 20; zo = 30; num_angles = 3600; latitudes = -80:20:80; % la...

6 years ago | 0

How do I store result from a loop into matrix?

The first column of S can be indexed S(:,1). The nth is S(:,n); Instead of making 360 different matrices with different names...

6 years ago | 1

| accepted

How To Plot Data From A Cell Array Containing (x,y) Coordinates?

Niv, I assume you're putting things into a cell array on purpose. That's an unnecessary step since each element is the same shap...

6 years ago | 0

How to plot volumetric concentration points in a slice meshgrid?

Ok, looks like you've got your volumetric plots going. It's easy from here. First, to display a color scale, the command is ...

6 years ago | 0

| accepted

MATLAB question regarding loop

In general, when inside a loop you can keep track of "something" simply by assigning that value to an element in a vector using ...

6 years ago | 0

please help to solve this error " In an assignment A(:) = B, the number of elements in A and B must be the same." . code is attached in zip file.

You're trying to assign a [1, 2] vector to a [1, 1] scalar. x_temp(stage) = abs(x_temp1).*y; 'stage' is a single value,...

6 years ago | 0

| accepted

Combine for loop output??

If you're not trying to be pretty or efficient you can do the following: for draw=1:number_of_lines ...

6 years ago | 0

| accepted

Cropping xyz data in MATLAB

You're trying to extract the data from the image file? imread will work find for this purpose. It will return an mxnx3 varia...

6 years ago | 0

| accepted

Help... Getting errors with v_plot and x_plot

Your code was quite difficult to understand without proper formatting and extra '*' spread around. I cleaned up the lines and ra...

6 years ago | 0

| accepted

Diagonal of a non-squared martrix

MATLAB has a built-in function for the identity matrix, 'eye'. There are two diagonals in a non-square matrix. We'll set both, o...

6 years ago | 0

How can I compute a contour bounded by the combination of multiple contour lines?

Just saw that you had posted a response that the noise in the small x isn't a concern. Well, I've got an overkill of overkill so...

6 years ago | 0

| accepted

How can I compute a contour bounded by the combination of multiple contour lines?

The solution is to find a convex hull that encompasses all the points from all the contours. An example using the 'peaks' func...

6 years ago | 0

X-axis Labeling

I think the problem has to do with the fact that when there are 1000 elements in an array, there are only 999 gaps between those...

6 years ago | 0

Why am I not getting the correct Phase angle when doing FFT

Without seeing your data I'm guessing you're not measuring the frequency at exactly the frequency the signal was generated at. T...

6 years ago | 0

Help with updating slice plot in for loop

You just need to draw a new slice with the new V_new. if true [X, Y, Z] = meshgrid([0 x], [0 y], [0 z]); h = slice(X,Y,Z...

6 years ago | 0

How to plot animation plots?

If you're just looking to animate what the plot is doing like in the video, just include a 'drawnow' command inside a for loop. ...

6 years ago | 1

3D plot confusion

Assuming you're making the exterior of the ship from mesh or surface commands. Those commands will connect dots and make patches...

6 years ago | 0

How can I read, in matlab, an image I have on my desktp with the imread () function?

You must put the name of the image in single quotes in the command. If the image is in a path beneath where MATLAB is currently ...

6 years ago | 0

Good day im trying to plot a graph of the effect of distance of separation between the TX/RX and the receive signal strength, using Friis's free space equation. I am having an issue with the graph when my pr is in db unit.

You're plotting exactly what you're asking for. However, I don't think you're asking what you think you're asking. Your definiti...

6 years ago | 0

plotting streamlines from velocity components

Michael, I've got some code below that plots slices and streamlines for your data but the data itself is odd. It looks like y...

6 years ago | 0

| accepted

How do I comment out a large block of code in MATLAB?

Rather than comment large sections of code, I bypass them with the following syntax. for dont_go_here = [] % code I wa...

6 years ago | 2