Community Profile # Chris

Last seen: 4 days ago Active since 2018

doin' a PhD.

Programming Languages:
Python, C, MATLAB

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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...

11 days ago | 1

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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...

12 days ago | 0

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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...

14 days ago | 1

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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 =...

24 days 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 =  Use an intermedi...

24 days 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...

1 month ago | 0

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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]...

1 month ago | 0

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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...

2 months ago | 1 answer | 1

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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...

2 months ago | 0

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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)...

2 months ago | 1

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

2 months 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...

2 months ago | 0

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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: ...

5 months ago | 0

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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...

5 months 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;

5 months 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 ...

5 months ago | 0

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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...

5 months ago | 0

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

7 months ago | 0

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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...

7 months ago | 0

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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...

7 months ago | 0

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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...

7 months 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 ...

7 months ago | 0

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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: ...

7 months ago | 2

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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...

7 months 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...

7 months ago | 0

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

7 months 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...

8 months ago | 1

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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...

8 months ago | 1 answer | 1