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Mikhail


Last seen: 1 month ago |  Active since 2014

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Question


Use matrix c\c++ API with row-based indexing
Hi all, in my project I perform some calculations in c++, and then I am using Matrix API (mxCreateNumericArray) to save my 2D ar...

9 years ago | 1 answer | 0

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answer

Question


Run CUDA or PTX Code on GPU
Hi all, I have a problem with running CUDA code on GPU. According to <http://www.mathworks.com/help/distcomp/run-cuda-or-ptx-co...

9 years ago | 1 answer | 1

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answer

Answered
getting string from gui textbox into dsolve
After reading the strings ('Dy=x^2' , 'y(1)=1' , 'x') you should convert everything into cell array ( <http://www.mathworks.com/...

9 years ago | 0

Answered
creating a matrix of zeros of size of another matrice
So zeros(a1,a2) creates a matrix of zeros with a1 rows and a2 columns, for example: a=zeros(2,3) is a=0 0 0...

9 years ago | 1

| accepted

Answered
GPU arrayfun with shared arrays
You can try to use your function without arrayfun. If at least 1 of the arguments is on GPU, calculations will be performed on G...

9 years ago | 0

Answered
How to get diffraction pattern (fft2) from image of double slit(jpeg image)
After you get grayscale (2D array) Image, in order to get binary image you can use <http://www.mathworks.com/help/images/ref/im...

9 years ago | 0

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Answered
How to find only negative root of any polynomial
If you have symbolic math toolbox, function <http://www.mathworks.com/help/symbolic/vpasolve.html vpasolve> will find all roots...

9 years ago | 0

Answered
I want to read audio data from a file. Can anybody help me?
You didn't set here the name of your file, it should be something like "test.wav"

9 years ago | 0

Answered
how do i plot a graph in xy-plane?
First, you should define everything: h = 6.25 * 10^(-34); x=1:100; y=h.*x; Plot(x,y) So here you fi...

9 years ago | 0

Answered
How to find slope for each pixel?
As i understood, you need to find b=S/A in each point, so you need to use term-by-term division: b=S./A;

9 years ago | 0

Answered
How to get the correct value from the given matrix?
The simplest way is to write b=a(1,:)

9 years ago | 0

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Answered
two dimension array mean and deviation calculation
There are a lot of ways to do that. I would generate 3D array, where the third dimension will be of the size = # of rounds (5); ...

9 years ago | 1

| accepted

Question


GPU amount of availible shared memory is less that it is seemed to be
Hi all, I am just started to use GPU. So, I tried to compute example from http://www.mathworks.com/products/parallel-computing...

9 years ago | 1 answer | 0

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answer

Answered
Join some matrices to one matrix
new=[]; for i=1:n % n - number of cells new=[new;m{i}(:)] end %%% So we take each m{i}, turn it into 1...

9 years ago | 1

| accepted

Question


error with arrayfun and GPU computing part 2.
I am tring to compute simple example on GPU: function C=myf(A,B,N) for i=1:N C(:,:,i)=(A(:,:,i)*B)^10; ...

9 years ago | 1 answer | 0

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answer

Answered
GPU computation error: please help
GOt it, just another commands in 2012 version.

9 years ago | 0

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Question


GPU computation error: please help
HI all, I want to use GPU in my research. I downloaded simple example from mathworks (code is attached). Basically, code is: ...

9 years ago | 1 answer | 0

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answer

Question


Why vectorized calculations are faster than for loops?
Why it's faster in Matlab? Is it because better memory treating, or paralleling? If this is only due parallel computation, on s...

9 years ago | 1 answer | 0

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answer

Question


parfor calculations take longer time than for
I am starting to work with the Parallel Computing Toolbox, and just constructed simple example to compare for and parfor: t...

9 years ago | 1 answer | 0

1

answer

Answered
writing a loop for differences of random numbers.
%Generate: for i= 1:1000 b(i) =rand; end %Subtract: c=zeros(1000,1000) for i =1:1000 c(i,:)=b-b(i); end ...

9 years ago | 0

Answered
Solving System of 5 ODEs using ODE45
You can always get two first order ODE from one second order: if you have 2nd order ODE for y(t), use y1=y(t), y2=y'(t)=dy/dt...

9 years ago | 0

Question


locate particles in squares (combinatorics)
I have a problem: I have a lot of particles with given coordinates (x,y). My (x,y) plane is divided into a bunch of squares 32x...

9 years ago | 1 answer | 0

1

answer

Answered
How do I store user input values from a for loop?
Create a vector to store your data,say,a: a=zeros(x,1) in for loop save values on each step: for R=1:x a(R)=input('W...

9 years ago | 0

Answered
Extract multiple data series from *.fig
1) get id of your axes: a=get(gcf,'Children') 2) get data you needed: y=(get(a(1),'Children'),'YData') If there is ...

9 years ago | 0

Answered
Double integral of a simple function
integral2 http://www.mathworks.com/help/matlab/ref/integral2.html

9 years ago | 0

Answered
Help: Display a different layout when pushing a button in a GUI?
Didn't see your code. In your push button callback function write: set("edit box id",'String','tab2'), where "edit box id" is yo...

9 years ago | 0

Question


Debug mode in code with blocks(cells)
Hi, I often use blocks (cells?) (%%) in my programm. When I want to debug,say,third block, I insert breakpoint somewhere in this...

9 years ago | 2 answers | 1

2

answers

Answered
Delet zeros after final number
There are plenty of ways to do that. For instance, find(A) will find indexes of all nonzero elements. So you can write: B= A(...

9 years ago | 0

Question


Subtract column from a matrix
In matlab it is easy to subtract number from column or row. I want to subtract column [n x 1] from a matrix [n x m]. Is it possi...

9 years ago | 2 answers | 0

2

answers

Answered
mean without stable step
You can write a=mean(M,2) - this will find mean of matrix M along each column. And then take only values you need. For 3033*2005...

9 years ago | 0

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