KSSV

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8,611 total contributions since 2011

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

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Answered
Matlab error, Z must be a matrix, not a scalar or vecto
r= 5; theta= 60 ; ro=5; w1=200; w2=300; t=0:1:60; dt=diff(t); dt = unique(dt) ; x=ro*cos(w1.*t)+r.*cos(theta+(w1+w2...

3 days ago | 0

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Comparative Operator result is wrong
Note that you are comparing two floating point numbers and such numbers cannot be comapred using ==. Follow tol = 10^-5 ; idx...

3 days ago | 0

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Preallocating cells with unknown output size
You can try to initilize them as X = cell([],[]) ; You can check the timing using tic , toc.

3 days ago | 0

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Why is the graph linear instead of curve?
You have to increase the number of values in x, when calling the function. x=[0 8 16 25 37]; y=[5 17 12 21 19]; disp("Los da...

3 days ago | 0

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Output argument "output" (and maybe others) not assigned during call to
Check in your function/ file the output which you are seeking is not present. a = myfunc(2,3) ; function out = myfunc(b,c) ...

3 days ago | 1

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Answered
Array processing operation and summation
To achieve this you need to read about input and for loop. Use input and enter the value of N. Initialize the required sum ...

3 days ago | 0

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; ...

6 days 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))) ...

6 days ago | 0

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

6 days ago | 0

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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...

6 days 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"))...

6 days 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...

7 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)

7 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...

7 days ago | 0

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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......

7 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...

7 days ago | 0

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

7 days ago | 1

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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 ...

7 days ago | 0

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

7 days ago | 1

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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)

8 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)

8 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...

8 days ago | 0

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

8 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...

9 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

9 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'...

9 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

9 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")...

9 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

10 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)=[]

10 days ago | 1

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