Answered

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...

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...

8 years ago | 0

Submitted

quiver_tri(x,y,u,v,varargin)

Quiver plot with filled triangles head

8 years ago | 7 downloads |

Answered

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...

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...

8 years ago | 0

Answered

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...

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...

8 years ago | 0

| accepted

Answered

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...

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...

8 years ago | 0

Answered

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...

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...

8 years ago | 0

Answered

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...

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...

8 years ago | 0

Answered

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. ...

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. ...

8 years ago | 0

Solved

Pizza!

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

8 years ago

Solved

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 ...

8 years ago

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...

8 years ago | 1 answer | 0

Submitted

Transform velocity field into wall coordinates

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

8 years ago | 2 downloads |

Solved

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 ...

8 years ago

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...

8 years ago | 1 answer | 0

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...

9 years ago

Solved

Determine if input is odd

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

9 years ago

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...

9 years ago | 0 answers | 1

Submitted

xcorr2_fft(a,b)

Two-dimensional cross-correlation evaluated with FFT algorithm

9 years ago | 8 downloads |

Answered

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...

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...

9 years ago | 0

Question

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...

9 years ago | 1 answer | 0

Question

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...

9 years ago | 1 answer | 0

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....

9 years ago | 1 answer | 0

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...

9 years ago | 1 answer | 0

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...

9 years ago | 0 answers | 1

Answered

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

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

9 years ago | 0

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 ...

9 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...

9 years ago