# 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 -...

5 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 ...

5 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) -...

5 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,...

5 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...

7 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)) ...

7 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...

7 months ago | 0

| accepted

Submitted

GaussElimination

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

7 months ago | 6 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...

8 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.

8 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 ...

8 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 ...

9 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*...

9 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...

9 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...

9 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.

9 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...

11 months ago | 1 answer | 0

### 1

answerSolved

Perimeter of a semicircle

Given the diameter d, find the perimeter of a semicircle

1 year ago

Solved

Pi Estimate 1

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

1 year 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...

1 year 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,...

1 year 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...

1 year 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) ...

1 year 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

1 year 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

1 year 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...

1 year ago

Solved

MATLAB Basic: rounding IV

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

1 year ago

Solved

MATLAB Basic: rounding III

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

1 year ago

Solved

MATLAB Basic: rounding II

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

1 year ago

Solved

MATLAB Basic: rounding

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

1 year ago