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# Sergey Kasyanov

### Saints Petersburg Politechnical University

Last seen: circa un mese ago Active since 2017

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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 -...

circa un anno ago | 0

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 ...

circa un anno ago | 0

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) -...

circa un anno ago | 1

| accepted

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,...

circa un anno 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...

circa un anno ago | 1 answer | 0

### 1

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)) ...

circa un anno ago | 0

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...

circa un anno ago | 0

| accepted

Submitted

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

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...

oltre un anno ago | 0

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.

oltre un anno ago | 0

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 ...

oltre un anno ago | 1

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 ...

oltre un anno ago | 0

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*...

oltre un anno ago | 0

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...

oltre un anno ago | 0

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...

oltre un anno ago | 0

| accepted

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

oltre un anno 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...

oltre un anno ago | 1 answer | 0

### 1

Solved

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

oltre un anno ago

Solved

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

oltre un anno 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...

oltre un anno ago

Solved

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

oltre un anno 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...

oltre un anno 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) ...

oltre un anno 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

oltre un anno 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

oltre un anno 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...

oltre un anno ago

Solved

MATLAB Basic: rounding IV

oltre un anno ago

Solved

MATLAB Basic: rounding III

oltre un anno ago

Solved

MATLAB Basic: rounding II