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Sergey Kasyanov


Saints Petersburg Politechnical University

Last seen: 12 days ago Active since 2017

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  • Matrix Manipulation I Master
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Answered
Optimisation problem in matlab
Hello! Try that: % tune only next 2 lines L = 5;% steps in ladder Z_max = 1e2;% max Z for one R or Xl % goal Z(w) % w0 -...

4 months ago | 0

Answered
Detecting missing data, tangent = 0, for given data.
Hello! The approach is very simple: get array with 1 when Y = 0 and 0 otherwise, then detect when 0 changes to 1 and 1 changes ...

4 months ago | 0

Answered
plot arc that pass through a particular point
Hello! The simplest way is: figure; hold on; for i = 1 : size(XX,2) [~, n] = max(XX(:,i)); plot3(XX(:,i), YY(:,i) -...

4 months ago | 1

| accepted

Answered
How to get the function after solving the differential equation using Eulers method?
Hello! A = [1, -1 -1, 1]; x0 = [1 2]; dx = [0 0]; time_step = 0.1; time = 0 : time_step : 10; x = [x0,...

4 months ago | 0

| accepted

Question


Symbolic matrices multipleid incorrectly
Hello! I have matrix equation: When I try to find X I get incorrect result: Check does not pass: I attach a .mat fil...

5 months ago | 1 answer | 0

1

answer

Answered
Replacing matrix n column values
Hello, There are some no pretty but working solutions, n = [70, 80]; %A is MyMatrix %1 A(A(:).' < 0 &... (1:numel(A)) ...

6 months ago | 0

Answered
How to get the symbolic determinant of a big matrix 13x13 size
Hello! Try to use my function GaussElimination: detM = prod(diag(GaussElimination(M, ''))); I test it. It works but I'm not s...

6 months ago | 0

| accepted

Submitted


GaussElimination
Function to symbolic (for numerical too but very slow) parallel gaussian elimination for matrix.

6 months ago | 7 downloads |

Answered
how to generate permutations of N numbers in K positions
Hello! Use nchoosek function with combination of perms function. That solution is slow but does not require any side files. re...

7 months ago | 0

Answered
I want the right coding for ploting a horizontal line with sin wave
Hello! hold on plot([x1,x2], [y,y]) Line starts in [x1, y] point and ends in [x2, y] point.

7 months ago | 0

Answered
why do i receive this error
Hello! You don't define f in fn function. Are you want to return f = [fy, fy2]? In that case: function f = fn( x , yic ) dy ...

7 months ago | 1

Answered
If condition is met, find next instance of a certain value.
Hello, If you have array with values that you need to find you can use that code: values_to_find = [226 226 225 221 226 226 2 ...

7 months ago | 0

Answered
Can anyone help me solve this problem using Newton's Method?
Hello, try that i = 1; V0 = [1;0];%[x0;y0] V = V0 + 1; while max(abs(V0 - V)) > 1e-10 && i < 1e2 V = V0; J = [3*...

7 months ago | 0

Answered
Double checking a for loop
Hello, sum(temp/intchl) -> sum(temp)/intchl means that you divide sum of all values by sum of mean values. Lets write it in det...

7 months ago | 0

Answered
How to index for saving an output of a for loop for each loop?
Hello, try that I = 0.1:0.1:0.7; Saved = zeros(4,length(I)); for i = 1:length(I) 'Calculating somestuff here' 'Use...

7 months ago | 0

| accepted

Answered
Signal generator from .m file to simulink
Hello, you can use From Workspace block with [t', q_di'] as Data parameter.

7 months ago | 0

| accepted

Question


subsref works as not expected
Hello! Let's create random cell array. test = {1,2,3,4}; And try to evaluate simple code res_1 = ones(subsref(test, substruc...

9 months ago | 1 answer | 0

1

answer

Solved


Perimeter of a semicircle
Given the diameter d, find the perimeter of a semicircle

11 months ago

Solved


Pi Estimate 1
Estimate Pi as described in the following link: <http://www.people.virginia.edu/~teh1m/cody/Pi_estimation1.pdf>

11 months ago

Solved


Calculate area of sector
A=function(r,seta) r is radius of sector, seta is angle of sector, and A is its area. Area of sector A is defined as 0.5*(r^2...

11 months ago

Solved


How to add?
* Imagine you are in 2222 Anno Domini, when everyone must learn how to add, * and competing for the highly prestigious post of,...

11 months ago

Solved


Find the maximum number of decimal places in a set of numbers
Given a vector or matrix of values, calculate the maximum number of decimal places within the input. Trailing zeros do not coun...

11 months ago

Solved


Make roundn function
Make roundn function using round. x=0.55555 y=function(x,1) y=1 y=function(x,2) y=0.6 y=function(x,3) ...

11 months ago

Solved


Matlab Basics - Rounding III
Write a script to round a large number to the nearest 10,000 e.g. x = 12,358,466,243 --> y = 12,358,470,000

11 months ago

Solved


Matlab Basics - Rounding II
Write a script to round a variable x to 3 decimal places: e.g. x = 2.3456 --> y = 2.346

11 months ago

Solved


Check that number is whole number
Check that number is whole number Say x=15, then answer is 1. x=15.2 , then answer is 0. <http://en.wikipedia.org/wiki/Whole...

11 months ago

Solved


MATLAB Basic: rounding IV
Do rounding towards plus infinity. Example: -8.8, answer -8 +8.1 answer 9 +8.50 answer 9

11 months ago

Solved


MATLAB Basic: rounding III
Do rounding towards minus infinity. Example: -8.8, answer -9 +8.1 answer 8 +8.50 answer 8

11 months ago

Solved


MATLAB Basic: rounding II
Do rounding nearest integer. Example: -8.8, answer -9 +8.1 answer 8 +8.50 answer 9

11 months ago

Solved


MATLAB Basic: rounding
Do rounding near to zero Example: -8.8, answer -8 +8.1 answer 8

11 months ago

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