# KSSV

https://sites.google.com/site/kolukulasivasrinivas/ Professional Interests: Mathematical Computing

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Python, MATLAB, Fortran

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English, Hindi, Telugu

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**Content Feed**

How to save matrixes resulted from a running loop for further use in MATLAB

Let mxn be your matrix size and you are running loop ntimes. In this case you can save the matrix in the loop using the below co...

40 minutes ago | 0

how i can solve this problem? unrecognized function or variable to run my code

I think this is what you need. % Define the operating frequencies in Hz freqs = linspace(1e9, 6e9, 100); % 100 equally spaced ...

44 minutes ago | 0

how to convert cell to mat

REad about real and imag R = real(htemp); C = imag(htemp) ;

3 hours ago | 0

2D array to 1D with rows appending after another row

A =[1 2 3 ; 4 5 6] ; iwant = reshape(A',1,[])

1 day ago | 1

| accepted

Vector plots by Quiver in MATLAB

[X,Y,Z] = peaks(100) ; [u,v] = gradient(Z) ; w = sqrt(u.^2+v.^2) ; pcolor(X,Y,w) ; shading interp ; colormap(jet); hol...

1 day ago | 1

How can I avoid using for loop in this functions

function y=Besselj_approx(n,z) i = n ; y=zeros(1,length(n)); y(1:end)=-z.^2/4+1; y(i>0) = 1./gamma(i(i>0)+1).*(z/2).^i(i>0);...

2 days ago | 0

How do I save a file in excel to matlab current folder?

T = readtable('myfile.xlsx') ; T

4 days ago | 0

Given x= rcos(𝛼) ; y=rsin(α); write MATLAB program to plot a circle of unit radius (r=1).

This is a simple homework... You should do it your self. Read about: Linspace for making angle between 0 to 360 i.e. 0 to 2*pi ...

4 days ago | 1

Plotting 3D by rotate 2D plot around y-axis

This might be useful. Checkout: https://in.mathworks.com/matlabcentral/communitycontests/contests/4/entries/4996

5 days ago | 0

Averaging data between two integer and corresponding column of a matrix

A = [1 2 3 4 5 6; 1.234 1.11 1.3 2.31 2.3 2.4]' ; idx = fix(A(:,2))==2 ; mean(A(idx,1))

7 days ago | 0

How to make a linear regression coefficient algorithm

x = 1:10 ; y = rand(1,10) ; [a,b] = linreg(x,y) ; % Check p = polyfit(x,y,1) ; [a b ; p(2) p(1)] function [alpha, b...

7 days ago | 0

How to create a custom colormap ("seismic" from python)

Refer this: https://in.mathworks.com/matlabcentral/fileexchange/45208-colorbrewer-attractive-and-distinctive-colormaps https:/...

7 days ago | 1

| accepted

what is the meaning of this error? how to stop this error?

You have copied this function named 'Forward_model' under a script/ code whose file name is also same as the function i.e. Forwa...

10 days ago | 0

Keeping same colors for the same groups in different group scatter plot

P = rand(1000,2) ; x = P(:,1) ; y = P(:,2) ; idx = kmeans(P,4) ; figure h = gscatter(x,y,idx) ; % Get colors C = resha...

11 days ago | 1

| accepted

Why doesn't it work ? Please help

dt = 0.01; t = 4; T = 0:dt:t; % First Quarter r1 = 0:dt:t/4 ; p1 = sin(pi.*r1) ; plot (r1,p1) % Define second Qua...

12 days ago | 0

matlab polyfit multiple sets of y data

Run a loop for each set..... Let y be your mxn data and x be your 1xn data. p = cell(m,1) ; for i = 1:m p{i} = polyfut...

12 days ago | 0

Can't run my 'if, elseif, else' code

score= randi(100); if score < 20 grade = 'D'; elseif score < 40 grade= 'C'; elseif score < 60 grade= '...

13 days ago | 0

| accepted

Not enough input arguments

f = @(x,y) x.*y + 10*sin(x).*cos(y); x = linspace(0,2*pi) ; y = linspace(0,2*pi) ; [X,Y] = meshgrid(x,y) ; Z = f(X,Y) ; su...

13 days ago | 1

can you help me to solve this equation?

syms x P = sqrt(27.8*exp(5*x)-1) == cos((120*x^2+sqrt(2*x))/(17*x-65))^(-1) ; s = vpasolve(P,x)

21 days ago | 0

Syntax problem with a user-defined function with sine

function r = my_function(thet) r = pi*(3-sin(theta)^5) ; end Save the above, it will be saved on he name my_function.m. ...

25 days ago | 0

Matrix multiplication gives different result than manual dot products with each column

As you are comparing floatting point number, you should not use isequal. You should proceed like shown below: N = 1000; B = 10...

26 days ago | 0

How to plot the streamlines and arrow surface in MATLAB from columns of data?

clc ; clear all ; % T = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1311670/streamlines%20plot.txt...

26 days ago | 0

| accepted

trying to align multiple sin waves onto same graph with the period of the wave on the x axis.

Take same time array for all the waves. g = 9.807; T = 11; H = 4; d = 30; CD = 0.85; CM = 1.77; Rho = 1025; D = 1; u =...

27 days ago | 0

Double X-axis(t,p1) and single Y-axis(p2) depending on t

T = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1309930/b1.xlsx') ; t = duration(T.Time); p1 = T....

28 days ago | 0

How to apply the same style/color and axes labels to all subplots?

colors = ["k"; "r";"g";"r";"g"]; lines = ["-"; "-";"-";"--";"--"]; tiledlayout(2,2); ax(1) = nexttile ; plot(rand(10,1)...

28 days ago | 1

| accepted

How to get the decimal values using solve in MATLAB

Read about vpasolve, double.

29 days ago | 1

How do I repeat the comand for another line

dt = dx1./v; % let dt be 10x1 array m = length(dt) ; n = 60001 ; temp0 = zeros(m,n) ; for i = 1:n tempo(:,i) = 0:dt...

29 days ago | 0

| accepted