Community Profile # Mikhail

### Northwestern University Evanston

Last seen: 3 månader 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...

nästan 7 år ago | 1 answer | 0

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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...

nästan 7 år ago | 1 answer | 1

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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/...

ungefär 7 år ago | 0

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...

ungefär 7 år ago | 1

| accepted

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...

ungefär 7 år ago | 0

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...

ungefär 7 år ago | 0

| accepted

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...

ungefär 7 år ago | 0

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"

ungefär 7 år ago | 0

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...

ungefär 7 år ago | 0

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;

ungefär 7 år ago | 0

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

ungefär 7 år ago | 0

| accepted

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); ...

ungefär 7 år 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...

ungefär 7 år ago | 1 answer | 0

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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...

ungefär 7 år 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; ...

ungefär 7 år ago | 1 answer | 0

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GOt it, just another commands in 2012 version.

ungefär 7 år ago | 0

| accepted

Question

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

ungefär 7 år ago | 1 answer | 0

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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...

ungefär 7 år ago | 1 answer | 0

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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...

ungefär 7 år ago | 1 answer | 0

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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 ...

ungefär 7 år ago | 0

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...

ungefär 7 år ago | 0

Solved

Reverse the vector
Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]

ungefär 7 år ago

Solved

Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

ungefär 7 år ago

Solved

Make a run-length companion vector
Given a vector x, return a vector r that indicates the run length of any value in x. Each element in r shows how many times the ...

ungefär 7 år ago

Solved

Flag largest magnitude swings as they occur
You have a phenomenon that produces strictly positive or negative results. delta = [1 -3 4 2 -1 6 -2 -7]; Marching thr...

ungefär 7 år ago

Solved

Given a window, how many subsets of a vector sum positive
Given a vector: [1 0 -1 3 2 -3 1] and a window of 2, A sliding window would find: 1 + 0 = 1 0 - 1 = -1 ...

ungefär 7 år ago

Solved

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

ungefär 7 år ago

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 ...

ungefär 7 år ago

Solved

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

ungefär 7 år ago

Solved

Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.

ungefär 7 år ago