Geoff

Actif depuis 2012

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I use MATLAB for small jobs and C++ for real jobs.
Professional Interests: Problem solving

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HOW CAN I CALCULATE THE SIGNAL TO NOISE RATIO(SNR) OF A CHIRP SIGNAL
From Wikipedia: http://en.wikipedia.org/wiki/Signal-to-noise_ratio NR = Psignal / Pnoise = (Asignal / Anoise)^2 Where P is powe...

plus de 3 ans il y a | 0

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Help with proper parfor
You can't write to a parallel-segmented matrix in the inner loop. Try this: parfor i=1:r col = zeros(n,1); f...

plus de 12 ans il y a | 0

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How can I import a .txt file correctly using textscan?
The way to have the most control over a line-based txt file import is to read it one line at a time: while !feof(fid) ...

plus de 12 ans il y a | 1

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Script adapted into a funtion Function not returning equal values
Floating point precision errors. If you need to test for zero, then test for something like: if abs(value) < 1e-5 10^-5 ...

plus de 12 ans il y a | 0

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time to number conversion
From memory, if you use |datenum| to just get the time with no date, it doesn't return a number between 0 and 1. But you can ge...

plus de 12 ans il y a | 0

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Do you think that MATLAB is expensive?
Yes, I think it is expensive. In New Zealand, it's about $2000 per toolbox. The compiler is over $8000. The work I was doin...

plus de 12 ans il y a | 0

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Can you use cell or struct as function input？
Yes, and yes. I'm puzzled that you're asking this here when you could quite easily test for yourself... Part of the process ...

plus de 12 ans il y a | 3

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Save data from a loop
I think this might be what you want: for f = 1:40 for g = 1:40 i = (f-1) * 40 + g; dpTxcouple1(:,:,i) = ...

plus de 12 ans il y a | 0

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Answering my own question
If it really is about something cool, then I'm in agreement with the others. Go for it... People could still add their own ans...

plus de 12 ans il y a | 0

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can someone explain this code?
|x1_Y| is an array of indices. You're doing a boolean test on |x1(10:300)| to determine if a point is an outlier. That is, it ...

plus de 12 ans il y a | 0

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Need some assistance with "if" command
Oh, the better way is to use the proper MATLAB error function: if a < 0 error( 'Not a valid input.' ); end

plus de 12 ans il y a | 0

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Need some assistance with "if" command
If you don't have a function or anything to return from, there's a sneaky little trick you can use. This can be useful for othe...

plus de 12 ans il y a | 0

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As a Software Engineer, Why should I use MATLAB?
From one developer to another, the answer is: *why not??* What do you have to lose from having another tool (or rather, arsen...

presque 13 ans il y a | 1

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frequency
<http://www.google.com/?q=quiescent+frequency>

presque 13 ans il y a | 0

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What do I have to do to sort strings properly in Listbox?
Don't ask the same question just because nobody answered it yesterday. If you are impatient, write a comment on it to bump it b...

presque 13 ans il y a | 0

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how to convert Julian date to Gregorian date ?
Use |datestr|

presque 13 ans il y a | 0

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realtime data streaming between matlab and opencv, visual c++
How "realtime" do you need? If you were polling a file multiple times a second, would that be sufficient? Can you do your anal...

presque 13 ans il y a | 0

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fprint error
Like the error message says, some of your inputs are structs, and that's not allowed. Run the following code to check the types...

presque 13 ans il y a | 0

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What is the purpose of this line in MATLAB's "factorial.m" function?
I would hazard that it is there to handle the special case of computing zero-factorial, which of course is 1.

presque 13 ans il y a | 0

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importing csv array of unknown size, characters
So the general thing is this... Keep track of the current state outside the loop: line_num = 0; % Current CSV line number...

presque 13 ans il y a | 1

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Non-numeric matrix to string
It's not a matrix. It's a cell array. You can try converting the whole thing to strings with something like: [M{:}] ...

presque 13 ans il y a | 0

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Computer Vision - Feature Detection and Tracking - Tracking a RC car in a video
Of course, but you might have to implement a bunch of complex algorithms yourself. If you're not familiar with vision processin...

presque 13 ans il y a | 0

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Find Min& Max Togather
Well, I do it like this: function [Amin, Amax] = minmax( A ) Amin = min(A); Amax = max(A); end Note: Not to...

presque 13 ans il y a | 0

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Slightly off topic: determining at the Windows system level when my process is done
Why don't you invoke the shutdown as the last thing your MatLab script does?

presque 13 ans il y a | 1

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Matrix to Table format
Are you saying you want to generate the SQL: CREATE TABLE my_table blah blah blah Followed by INSERT INTO my_table ...

presque 13 ans il y a | 0

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Combine Two Different Images With Different Gain Values
Here's what I'd do... Convert all your images to 16-bit. Then take the factor-1 image, multiply it by 10. Then take the fac...

presque 13 ans il y a | 1

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Temporal processing of image stack
Well, I'm not known for my solutions that take advantage of inbuilt MatLab functions... Maybe something like |filter| would be ...

presque 13 ans il y a | 0

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Financial contract value
Just a snippet of coding advice from me... If you need to use a number more than once, especially if it relates to how many v...

presque 13 ans il y a | 0

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Entering data into MATLAB from a csv file containing both data and letters
textscan(currentLine, '%s%s%c%d%d%d%d%f%f')

presque 13 ans il y a | 0

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Deleting X-Y points that are not near other points on a field of data points
Naive (brute force) implementation given by per isakson looks sufficient for this problem. O(N^2) is okay for 900 rows. For la...

presque 13 ans il y a | 0

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