# Thomas Satterly

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**Content Feed**

Pre-allocating memory for a while loop

If you don't know how large your arrays need to be for preallocating the entire array, what you can do is allocate "chunks" of t...

3 years ago | 0

Adding a Graph into a uipanel GUI

You need to create an axis object where the data will be plotted and pass this axis as the first argument to your plot function....

3 years ago | 0

How to create 2D matrix from 3D without a loop?

Here's one way to do it with vectorized code. Calculating the column index list can probably be done better, but it gets the ide...

3 years ago | 0

Plotting a meesh?

Without seeing your data, it's difficult to say exactly how you shoud go about representing your data. However, something like t...

3 years ago | 0

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Is it possible to take a Screenshot of a website with Matlab?

Here's one way to do it using some java from withing Matlab. If you want to save the resulting image, see imwrite. % Open up a ...

3 years ago | 1

Need help with heuns method (rk2) for second order DE

1) You forgot to index the variable "v" in a couple places 2) Matlab indicies start at 1, not 0. Corrected code: % Runge...

3 years ago | 0

| accepted

Change Logo on Matlab Figure (not GUI)

See a similar thread: https://www.mathworks.com/matlabcentral/answers/584-how-to-replace-matlab-icon-from-a-figure-window

3 years ago | 0

How to Set Sine Wave Frequency

Make sure your time step is small enough to capture oscillations on the order of GHz. You might be generating the "correct" sign...

3 years ago | 0

| accepted

Remove a number and its duplicates, not just the repeated values i.e. the way the unique function operates

This should lead you along the right track: % Ex: % A = [2;2;4;3;3;5;6]; % remove(A, 2) Removes all 2's % remove(A, 2, 3) R...

3 years ago | 0

how to select two arrays from a group of four

To find the sum square of an array: sumSquared = sum(array.^2); If you have your arrays all together in a matrix: % If eac...

3 years ago | 0

| accepted

Solved

Determine whether a vector is monotonically increasing

Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

3 years ago

Solved

Select every other element of a vector

Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

3 years ago

Solved

Triangle Numbers

Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

3 years ago

Solved

Make a checkerboard matrix

Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Examp...

3 years ago

Solved

Find the sum of all the numbers of the input vector

Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

3 years ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]

In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

3 years ago

Solved

Times 2 - START HERE

Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

3 years ago

adding for loop to prevent changing char to same char

This is an interesting problem and a fun challenge. You don't need a for loop, rather, you can only allow different letters to b...

3 years ago | 0

find(vector==value) not working

While it looks like the 17th value of your vector is 0.16, it's actually slightly off because of floating point precision. What ...

3 years ago | 1

Creating Variables with GUI inputs

There are a number of ways to store data in a GUI so that it's accessible to different functions. Matlab's suggested way of pass...

3 years ago | 0

Data acquisition and Visualisation of LIDAR sensor in REAL TIME

Matlab isn't very good at graphics with high update rates, but it is doable. I'd suggest looking at the line and scatter objects...

3 years ago | 1

| accepted

Custom class property and method attributes

So Matlab doesn't support this type of thing, which can't really be too surprising. The best way I've found to get around this i...

3 years ago | 0

| accepted

Plotting 3d orientation and position data (3d lines)

Check out quiver3 - it basically plots a vector field for the supplied points. For your case, you'll want X, Y, and Z to be the ...

3 years ago | 1

| accepted

Two y-axis colors

Assuming you did something similar to the code below, you can access the axis properties directly and change the color to whatev...

3 years ago | 0

| accepted

New to matlab, help?

Since this is an assignment, I'm not going to just give you the code, but there are a few pages you should look at to get you on...

3 years ago | 0

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User surface on piano

Matlab has button click callbacks for graphical types. There's always multiple ways to approach a problem, but this is the route...

3 years ago | 2

How to plot arrays of different sizes using interp1?

I would suggest using cross-correlation to find out where these two signals match up the best. The data you posted needs a littl...

3 years ago | 0

Get variables from my Matlab workspace

You should be using either inports or parameters to pass data from Matlab to you Simulink block. The "From Workspace" block work...

3 years ago | 0

| accepted

3D plot help

If you're expecting the independant variables X, Y, and Z to make some nice looking 3D surface, you can use Delaunay Triangulati...

3 years ago | 0

| accepted

Question

Custom class property and method attributes

I'd like to be able to define my own attributes in classes, but I'm not finding any documentation as to how that might be done. ...

3 years ago | 1 answer | 2