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KSSV


Last seen: 1 day ago

8,605 total contributions since 2011

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

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Answered
Extract data between thresholds
A = load('test.txt') ; A = A' ; ii = zeros(size(A)); jj = A > 0; ii(strfind([0,jj(:)'],[0 1])) = 1; idx = cumsum(ii).*jj; ...

1 day ago | 0

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Answered
Skipping a NaN in a loop
A = rand(5) ; % data for demo A(:,2) = NaN ; % replace a column with NaN for i = 1:5 if any(isnan(A(:,i))) ...

1 day ago | 0

Answered
How can I add angular noise to my vector?
Read about rand. X = X+rand(size(X)) ;

1 day ago | 0

Answered
How Can I solve this problem?
USe .^ instead of ^. H = 3; P = 100; ls = atan(P/H); fun = @(x) (2*(H/P)^2)*(x + (4/3)*x.^3 + (17/15)*x.^5 + (248/315)*x.^7...

1 day ago | 0

Answered
Trying to save a Matlab file with a timestamp
for i = 1:10 data = rand(100,1) ; fname = strcat('projjectile',string(datetime('now','Format',"yyyy-MM-dd-HH-mm-ss"))...

1 day ago | 0

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Answered
Add xyz arrows in plot
% points x = rand(50,1) ; y = rand(50,1) ; z = rand(50,1) ; % vectors u = rand(50,1)/10 ; v = rand(50,1)/10 ; w = r...

2 days ago | 1

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Answered
How do I plot the equipotential lines in matlab?
L = 1 ; x = linspace(-0.5,+0.5) ; lambda = sin(pi*x/L) ; plot(x,lambda)

2 days ago | 0

Answered
How to merge different data collected at different times?
Read all the files and save time of each file. Get the minimum and maximum of time out of the three files. Create date time a...

2 days ago | 0

Answered
Unable to convert expression into double array
This line: subs(diff) You have to substitute some value right? I guess you need to input value of t here......

2 days ago | 0

Answered
Machine learning for images dataset
If you have images to train the best you have imageDatastore. https://in.mathworks.com/help/matlab/ref/matlab.io.datastore.ima...

2 days ago | 0

Answered
Take average of multiple matrices
load data.mat ; A = cat(3,phi_BFD_v_sum{:}) ; iwant = mean(A,3) ;

2 days ago | 1

Answered
Plot data in map with LAT LONG
Refer this: https://www.eoas.ubc.ca/~rich/map.html You may see the below example for plotting. x = LON ; y = LAT ; z = power ...

2 days ago | 0

Answered
Extracting rows from table with specific digits
code = [{'116004.5'} {'116006.6'} {'120099.9'} {'120199.3'} {'120202.5'}] ; desc...

2 days ago | 0

Answered
Loading coordinates from workspace
x = rand(5,1) ; y = rand(5,1) ; z = rand(5,1) ; figure(1) plot3(x,y,z) ; figure(2) scatter(x,y,[],z)

3 days ago | 0

Answered
How can specify interval of variables in fsurf?
f1 = @(x,y) erf(x)+cos(y); x = -5:0.1:0 ; y = -5:0.2:5 ; [X,Y] = meshgrid(x,y) ; Z = f1(X,Y) ; surf(X,Y,Z)

3 days ago | 1

Answered
Sum up values of corresponding date time intervals.
You can find the respective date indices using find or logical indexing. Once you know the first date and last date indices, you...

3 days ago | 0

Answered
How to sum up a column in Matlab?
iwant = sum(T.(4))

3 days ago | 0

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Answered
how to find the end point coordinates of an object in binary image.?
I = imread('image.png') ; I1 = rgb2gray(I) ; [y,x] = find(I1) ; [idx,C] = kmeans([x y],3) ; imshow(I) hold on plot...

4 days ago | 0

Answered
cell array in cell array
n = length(a) ; iwant = zeros(n,1) ; for i = 1:n iwant(i) = a{i}{3} ; end

4 days ago | 1

Answered
How do I get a graph to spiral
t = linspace(0,10*pi,5000); r = 5. ; c = 4 ; x = r*cos(t) ; y = r*sin(t) ; z = c*t ; comet3(x,y,z) ; plot3(x,y,z,'Color'...

4 days ago | 1

Answered
How to separate the data in the table for loop?
Let C be your cell array. A = cell2mat(C(:)) ; A1 = A(:,1) % first column

4 days ago | 0

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Answered
Count EVEN and ODD numbers
clc; clear all ; a = input("Please enter 1st number: "); nE = 0 ; nO = 0 ; if mod(a,2)==0 disp("The 1st number is EVEN")...

4 days ago | 0

Answered
How do I create another column in a table which basically divides a T+1 / T number?
x = rand(10,1) ; y = rand(10,1) ; T = table(x,y) T.ratio = T.y./T.x

5 days ago | 0

Answered
Eliminating columns from the matrix
a=[0 12 13;0 5 4;0 9 6;0 8 9] idx = any(a)==0 ; a(:,idx)=[]

5 days ago | 1

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Answered
Element change in a matrix
Let A be your matrix. B = A ; B(B<30) = 0 ; % replace < 30 to 0 B(B>=30 && B<75) = 1 ;

5 days ago | 1

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Answered
Subtracts Two Cell Arrays to Yield a Third Array
Let C1 and C2 be two cell arrays of equal size and having same data each cell. N = length(C1) ; iwant = cell(N,1) ; for i =...

5 days ago | 0

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Answered
Get Two Cell Arrays To Same Size
load typevector_filtered.mat S = size(typevector_filtered{1}) ; for i = 1:length(typevector_filtered) if ~isequal(si...

5 days ago | 0

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Answered
Can someone help with my syntax error
If A is your array to count number of times a number n (say 5) appears, follow: tol = 10^-5 ; idx = abs(A-n)<=tol ; nnz(idx(...

6 days ago | 0

Answered
Filling in a spherical triangle
Read about delaunayTraingulation.

8 days ago | 0

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