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Sergey Kasyanov


Saints Petersburg Politechnical University

Last seen: ungefär en månad ago Active since 2017

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  • 3 Month Streak
  • Matrix Manipulation I Master
  • Knowledgeable Level 2
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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 -...

ungefär ett år 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 ...

ungefär ett år 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) -...

ungefär ett år 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,...

ungefär ett år 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...

ungefär ett år 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)) ...

ungefär ett år 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...

ungefär ett år ago | 0

| accepted

Submitted


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

ungefär ett år ago | 4 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...

mer än ett år 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.

mer än ett år 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 ...

mer än ett år 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 ...

mer än ett år 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*...

mer än ett år 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...

mer än ett år 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...

mer än ett år 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.

mer än ett år 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...

mer än ett år ago | 1 answer | 0

1

answer

Solved


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

mer än ett år ago

Solved


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

mer än ett år 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...

mer än ett år 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,...

mer än ett år 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...

mer än ett år 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) ...

mer än ett år 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

mer än ett år 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

mer än ett år 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...

mer än ett år ago

Solved


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

mer än ett år ago

Solved


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

mer än ett år ago

Solved


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

mer än ett år ago

Solved


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

mer än ett år ago

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