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how to integrate a function from 0 to inf?
You can, but it would require... an infinite time :) The answer mostly depends on your function. You could evaluate the funct...

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quiver_tri(x,y,u,v,varargin)
Quiver plot with filled triangles head

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Random number not repeatable with the same seed
The number of threads shouldn't affect your script, because matlab only use it internally. If you don't use a parfor or some too...

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Problem related to automatic isolation/separation/ segmentation of each tooth from dental x-ray image
It's not an easy task. Since there is no specific edge, brightness or anything that defines the shape of each tooth, I reckon th...

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How to implement a non uniform blur?
I don't know if this would be the best solution, but what you need is basically a filter that depends on the spatial position. I...

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Quickly load and add big matrices
The problem with loading big data is not Matlab, but the speed of you hard disk. The only way to load data in a quicker way is t...

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Convert binary ROI to polygon
You can use bwboundaries to get the boundaries of a binary image. If you want to sort them, you can evaluate the centre of yo...

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Double sum of a series
Why do you want to implement you own convolution when Matlab already has a very fast function for that? For loops are slow. ...

plus de 6 ans il y a | 0

A résolu


Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

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A résolu


Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

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Question


Understanding MATLAB file access
Hello, I'm working on a script where I have to read hundreds of images and do some calculations on them. I'm using a simple f...

presque 7 ans il y a | 1 réponse | 0

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Transform velocity field into wall coordinates
Interpolate velocity field on a wall-based grid. Useful to plot boundary layer

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Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

environ 7 ans il y a

Question


What is drawnow doing?
Hello everyone. I'm working on a code where I need to alternate the display of two complex plots in a very short time. The ti...

environ 7 ans il y a | 1 réponse | 0

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Is my wife right?
Regardless of input, output the string 'yes'.

environ 7 ans il y a

A résolu


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...

environ 7 ans il y a

A résolu


Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

environ 7 ans il y a

Question


Optimization of variable-length array
Hello, I'm trying to optimize a code where I have an array with unknown size and I'm not sure about two solutions that I have...

environ 7 ans il y a | 1 réponse | 1

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xcorr2_fft(a,b)
Two-dimensional cross-correlation evaluated with FFT algorithm

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Discrepancy between xcorr2 and fft2
I figured it out by myself, and I uploaded a script on the file exchange to get a numerically equivalent function of xcorr2 whic...

environ 7 ans il y a | 0

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Discrepancy between xcorr2 and fft2
Hello! I want to implement an fft cross-correlation in my algorithm in order to replace the much slower xcorr2. In theory, d...

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Session Manager
Save list of file open in Matlab editor

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Does keyboard slows down the code?
Hello. I was doing some tests to speed up my code, and I realized that having a keyboard in the code slows it down, even if t...

plus de 7 ans il y a | 1 réponse | 0

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Question


Parfor loop and variable length output
Hello everyone, I would like to speed-up a code using a parfor loop but my function is not straightforwardly suitable for it....

presque 8 ans il y a | 1 réponse | 0

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Question


Boolean matrix in mex file
Hello everyone, I'm trying to read a logical matrix in a mex file with matlab. The way I usally do for reading matrices in ma...

presque 8 ans il y a | 1 réponse | 0

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Question


Automatically generate functions from snippet of a script
Hello, When I write a code in matlab, I usually start writing a script. When the script gets bigger, I transform it into a fu...

presque 8 ans il y a | 1 réponse | 1

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A répondu
Does it possible to use a function with persistent variables several times?
If you want to clear the persistent variable you need to do it explicitly: clear example

presque 8 ans il y a | 0

A résolu


Add two numbers
Given a and b, return the sum a+b in c.

presque 8 ans il y a

A résolu


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 ...

presque 8 ans il y a

A résolu


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...

presque 8 ans il y a

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