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Vladimir Sovkov


St. Petersburg State University

22 total contributions since 2014

Professional Interests: computational physics, applied mathematics

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Vladimir Sovkov's Badges

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  • Knowledgeable Level 2
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Answered
Cell of character arrays
S=cell(10,1); S(1:5)={'cat'}; S(6:10)={'dog'};

33 minutes ago | 0

Answered
How to find all letters before a character in a char variable
split(secretMes,'#')

7 days ago | 1

Answered
How to plot for for a range? showing error
Probably, t^2 and t^4 are implyed to be t.^2 and t.^4. And all the multiplications of the expressions containing t are implyed ...

7 days ago | 0

Answered
Looping for storing differet matrix in different rows but in same matrix.
Before the loop, initiate Calculated_Data=zeros(numel(alpha_data),numel(alpha_data{1,1})); k=0; within the loop, use k=k+1; ...

7 days ago | 1

| accepted

Answered
Adding k discrete functions together in a "for" loop
If you do not need the "wave" contents for a further use, just drop out (k) from all its entries. If you need it for a further ...

7 days ago | 0

| accepted

Answered
Calculate n and p values for binomial distribution in Matlab
The question has nothing to do with Matlab. Just recall, that in the binomial distribution =n*p and =n*p*(1-p).

7 days ago | 0

Answered
Differentiating algebraic equation fractions
syms x; simplify(diff(@(x)((-x^2-x)/(x+2)*(x+3)),x))

10 days ago | 1

| accepted

Solved


Maximum value in a matrix
Find the maximum value in the given matrix. For example, if A = [1 2 3; 4 7 8; 0 9 1]; then the answer is 9.

10 days ago

Solved


Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...

12 days 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]; ...

12 days ago

Solved


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

12 days ago

Solved


How to find the position of an element in a vector without using the find function
Write a function posX=findPosition(x,y) where x is a vector and y is the number that you are searching for.

12 days ago

Answered
Optimization on for loop and if statement
firstPlace = find ( telArray(i,1) == sortedArray(:,3) ,1 ) replaces your entire "k" loop.

15 days ago | 0

Answered
How to check whether any two elements are equal or not in a Nx1 array in matlab?
%% z=randi(5,10,1); % forms a sample array; replace it with an array of your interest %% [~,indx]=sort(z); k0=1; while ...

19 days ago | 1

Answered
Fitting Multiple Data sets
The package "Optimizer" can help. See: https://sourceforge.net/projects/optimizer-sovkov/

19 days ago | 0

Answered
How to find the row numbers of similar elements
I think that the code in the attachment can help.

19 days ago | 0

Answered
Using existing arrays in workspace
A variable stored in the Matlab workspace is accessible from any Matlab script via just addressing its name. If you want it to b...

20 days ago | 0

Answered
interp1 fails to interpolate correctly
Why do you consider it is wrong? In the plot (see the attachment) this result looks quite reasonable.

20 days ago | 0

Answered
Are there any other ways(function) of finding jacobian matrix numerically beside the function numjac
The function you describe is no more than the squared norm of the vector x, i.e. it is a scalar function of a vector argument. ...

20 days ago | 0

| accepted

Submitted


Optimizer_sovkov
Constructing and optimizing general mathematical and physical models

21 days ago | 0 downloads |

Question


Fourier transform: unnecessary data transfer in FFT
Greetings! The FFT function in Matlab is said to be adopted from the FFTW project written in C and to possesses the same perfor...

21 days ago | 0 answers | 0

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answers

Question


Why I cannot access Intel Fortran 2013 from Matlab 2014a to create mex files?
Greetings! My laptop computer works under Windows 8.1 64 bit. I have installed Matlab 2014a (64 bit), MS Visual C++ 2013, a...

5 years ago | 0 answers | 0

0

answers