Community Profile

# Chris

Last seen: alrededor de 1 mes ago Active since 2018

doin' a PhD.

Programming Languages:
Python, C, MATLAB

All

#### Content Feed

View by

How to sum two gaussian curve fits (cfit) ?
You could evaluate the fits and add them, though they would no longer be cfits. x = linspace(20,35); F1pts = feval(F1,x); F2p...

alrededor de 2 meses ago | 1

| accepted

how to work with text files?
fopen is for low-level file operations you may not need. Perhaps try data = importdata('stud_ex.txt') Which will give you a s...

alrededor de 2 meses ago | 0

| accepted

why is this Matlab Code faster than the C++ code below? I want to understand what Matlab internally does better and faster than C++
I see an efficiency in primes.counter = primes.counter - 1; Matlab uses LAPACK for matrix/vector operations, which I think sho...

alrededor de 2 meses ago | 1

| accepted

Changing numbers in dataset
For only five values, I think it's pretty efficient to do a direct replacement: ds_new = zeros(size(dataset)) ds_new(dataset =...

2 meses ago | 1

Where is the error in my code?
The colon operator has a default spacing of 1. r = 0:0.07 gives: 0, % next value... 1 > 0.07 % so r = [0] Use an intermedi...

2 meses ago | 0

Issues updating vector inside a for loop
When find doesn't find any values > 0.999, it returns an empty vector, with a size of 0x1. Furthermore, max returns an empty vec...

2 meses ago | 0

| accepted

Increasing Edge Lines in a Surface Plot
sf = fit([x,u],z,'poly15','normalize','on'); xpts = linspace(min(x),max(x),100); upts = linspace(min(u),max(u),100); [xx, uu]...

2 meses ago | 0

| accepted

Question

Is there a good reason for choosing assert() over an if condition with an error?
I want to make sure a condition is valid, so I write a quick test for it with a boolean output. Does it matter whether I put the...

3 meses ago | 1 answer | 1

### 1

How to plot a .txt file when the data is in blocks and each data is separated by space
Wow, that is an inconvenient format. One option is to use the data import tool--right-click on the text file in matlab and "imp...

4 meses ago | 0

| accepted

How to append an image to a plot curve
You should be able to use a tiled layout. circuit = imread(which('RC_Charge_Circuit_Voltage.png')); figure tiledlayout(2,1)...

4 meses ago | 1

| accepted

Add row numbers to side of table in MATLAB
rownums = 1:size(T,1); T.Properties.RowNames = string(rownums);

4 meses ago | 1

Matching multiple file names
You'll have to fill in some of the blanks because I don't know how you're opening files, but to find the corresponding filenames...

4 meses ago | 0

| accepted

Quaternions with symbolic elements
The error says it all. It looks like symbolic variables aren't supported for quaternions. You might try a third-party toolbox: ...

6 meses ago | 0

| accepted

Why am I getting an error 'Execution of script cosamp as a function is not supported'
Using the function provided by @Elghandouri Mohammed and the original script, the error I get is: Error using _*_ Incorrect d...

7 meses ago | 0

Meshgrid or other structure?
Axis_A = (-96:8:96)/2; mgrid = Axis_A+Axis_A'; would give you that matrix. As would [x,y] = meshgrid(Axis_A); mgrid = x+y;

7 meses ago | 0

How do I convert tall array duration time vector to HH:mm:ss for merging with tall array datetime vector ?
dates = tall(repmat(datetime(date),3,1)) times = tall(repmat(duration(15,12,1,345,'Format','hh:mm:ss.SSS'),3,1)) times.Format ...

7 meses ago | 0

| accepted

why the plot doesn't work ,in the code i'm finding the estimation value of the phase using montecarlo simulation
since length(SNR) is 1, you are running one loop iteration and generating one point. plot() doesn't show one point unless you sp...

7 meses ago | 0

Graphical Draw Path Segments
Perhaps a "bezier toolbox" with an interactive mode would be useful: https://www.mathworks.com/matlabcentral/fileexchange/69302...

8 meses ago | 0

| accepted

How to produce results of script in table
Your variables are all updated in place, overwriting the previous state. You could make an array out of each variable, and upda...

8 meses ago | 0

| accepted

Imresize3 not resizing in z direction?
The second method should work. Are you sure you used imresize3() and not imresize() for that? For the first method, input all t...

8 meses ago | 0

| accepted

Differential Operator in Matlab in 1 Dimension
I'm not a math major so there's probably something technically wrong about this statement, but "d/dx" is essentially "dy/dx", re...

8 meses ago | 1

Find the number of red marks in box plot
One method, which may not necessarily correlate to a boxplot in all situations (but probably works for the default boxplot), is ...

8 meses ago | 0

| accepted

geting matlab installer to start on linux
From a comment deep in the thread (here), and from reading your symptoms, what typically works with this version of Ubuntu is: ...

9 meses ago | 2

| accepted

Converting datenums to get time durations
I don't see where WaveHeight is declared, but you can calculate a duration by subtracting datetimes. ThreshDate = datetime('now...

9 meses ago | 0

How can I identify the amplitude peaks from an FFT?
You can use findpeaks, probably with some additional parameters. For instance, if the plotted signal is P: Z = findpeaks(P,'Min...

9 meses ago | 0

| accepted

IF Statement Help?
This statement would flow like this, for a 30-degree angle (in pseudocode): if CurrentPosition < 45 % True, so... wri...

9 meses ago | 0

Help with a tiny project ( building a graph)
If I understand correctly, you only wish to plot I as a function of x. I have modified your function slightly (at the end of t...

9 meses ago | 1

| accepted

Question

Why are alternative forms for "dbstop in file at location if expression" not documented?
This question is prompted by another question here. It was fairly easy to guess that dbstop('file','10') would set a breakpoi...

9 meses ago | 1 answer | 1