# Sergey Kasyanov

### Saints Petersburg Politechnical University

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**Content Feed**

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

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

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

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

answerReplacing 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

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 |

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

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

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

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

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

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

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

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

answerSolved

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