# KSSV

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

**Programming Languages:**

Python, MATLAB, Fortran

**Spoken Languages:**

English, Hindi, Telugu

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**Content Feed**

Finding the highest mountain peak

[val,idx] = max(Z,[],3) ; Get the maximum along third dimension, idx gives you the thirs index where max occurs. Now find the ...

ungefär 7 timmar ago | 0

Find the polar representation of (𝑖 − √3 )

Hint: Use abs to find r. Use atan to find the angle. Use sin, cos to get the polar form. x = r*cos(theta) ; y = r*sin(th...

ungefär 9 timmar ago | 0

How do I find a maximum within a certain range

Let (x,y) be your data arrays. idx = x>0.1 & x<0.7 ; iwant = max(x(idx)) ;

ungefär 10 timmar ago | 0

Drawing a boundary box around an image?

I = imread('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1139790/bb.png'); props = regionprops(rgb2gray(I), 'B...

ungefär 10 timmar ago | 0

Pseudorandom character matrix generation

s = {'b', 'd', 'p', 'q' } ; S = cell(10) ; for i = 1:10 for j = 1:10 t = s(randperm(4,4)) ; S{i,...

ungefär 13 timmar ago | 0

How to interpolate a set of data with the cubic method?

x = [74 29 21 12 8 5.7 4.4 3.6 2.1 1.8 1.5 1.0 0.7]; y = [80 131 189 270 320 407 450 530 620 686 740 900 1095]; yi = linspac...

ungefär 13 timmar ago | 0

comparing two times to find the nearest minute for a specific time

Read about ismember, ismembertol, knnsearch

ungefär 13 timmar ago | 0

Error about preallocating for speed

You need to proceed likt his: % Alpha Fe a = []; T = 25:5:1000 ; nT = length(T) ; a = zeros(nT,1) ; for i = 1:length(T...

en dag ago | 0

Unsing string for indexing though structures

i = 108; % A = ((0.1255)/2)^2*pi; % ml_in_m3 = 1e-6; while i <= 108 pfad = '...'; s = strcat(pfad,'Test3_',string(i...

en dag ago | 0

create cell array by extracting all the same row from multiple matrix

D = cell(105,5) ; for i = 1:105 D{i} = [A(i,:) B(i,:) C(i,:)] ; end Or D = [A B C] ; D = num2cell(D,2) ;

en dag ago | 0

Extract a range of frequencies from a vector/array

new_value_from_fnew = fnew(fnew == 10e+009 | fnew > 30e+009); % <--- replace = with ==

2 dagar ago | 0

| accepted

Trying to define a circle within a matrix

[X,Y] = meshgrid(1:50) ; C = [mean(X(:)) mean(Y(:))] ; R = 10 ; th = linspace(0,2*pi) ; x = C(1)+R*cos(th) ; y = C(2)+R...

3 dagar ago | 0

How to find coordinate if only x is given?

Rm = sqrt(x.^2+y.^2) ; % get radius from mexh (x,y) R = 75 ; tol = 10^-3 ; idx = find(abs(Rm-R)<tol) ; iwant = [idx x(idx)...

3 dagar ago | 0

How to read all CSV files within a folder, combine into one master file using columns, and edit column headers?

folderPath1 = 'C:\Users\matav\Documents\MATLAB\example'; cd(folderPath1); % opens path of the folder csvFiles = dir('*.csv') ;...

4 dagar ago | 0

How do these Python commands have to look in Matlab to calculate A and B and show me the two results?

A = 10+10; B = A+10 ; fprintf('A = %f, B = %f\n',A,B) ;

4 dagar ago | 0

| accepted

Read multiple CSV files from different folders uing readtable

thepaths = {p1,p2,p3} ; for i = 1:3 % loop for ech folder csvFiles = dir([thepaths{i},'\*csv']) ; % get ll csv files in ...

4 dagar ago | 0

read many ncdata using ncread

ncfiles = dir('*.nc') ; N = length(ncfiles) ; for i = 1:N thisfile = ncfiles(i).name ; % do your calculation end...

6 dagar ago | 0

streamline function gives empty output

Try replacing NaN's in u, v with zero and use stream2.

6 dagar ago | 0

Graph appears blank but the equation and code are correct.

H_k_eq = @(k) (exp(-pi.*k.^2)) ./ (exp(-pi.*k.^2) + exp(-pi.*(4.*k).^2)); %<-- element by element division Range = -0.5:.01:...

7 dagar ago | 1

Solving Unknowns with Symbolic Toolbox

A = [1 1 0 0 ; 0 0 1 1 ; 1 0 1 0 ; 0 1 0 1] ; b = [3;7;4;6] ; x = pinv(A)*b Note that rank of A is 3, so...

7 dagar ago | 0

| accepted

Plotting a 3D matrix with plot3

LambdaL = linspace(0.000001,0.0001,20); % [Matrix in X axis] LambdaT = linspace(0.000001,0.0001,20); % [Matrix in Y axis] ...

8 dagar ago | 0

Write a program to input 3 integer digits (from 100 - 999), then in the numbers letters in hundreds, tens, and units ?

Read about input and see this file exchange: https://in.mathworks.com/matlabcentral/fileexchange/47221-number-to-words

8 dagar ago | 0

How to Plot Excel file in MatLab

Load the excel file into MATLAB using readtable. If you have time series; use plot. If 2D use pcolor. If scattered data use scat...

8 dagar ago | 0

Multiple data file loading to run some functions

fname = dir('*.txt') ; % gets all text files N = length(fname) ; for i = 1:N txtFile = fname(i).name ; % load t...

9 dagar ago | 0

| accepted

Rotating X & Y Data

p1 = rand(2,1) ; p2 = rand(2,1) ; %%rotation matrix th = 90*pi/180 ; R = [cos(th) -sin(th) ;sin(th) cos(th)] ; %%rotate po...

9 dagar ago | 0

Finding equilibrium points for an ODE system

tol = 10^-5 ; % change the tolerance idx = abs(cdot)<tol & abs(cddot)<tol ; [cdot(idx) cddot(idx)]

9 dagar ago | 0

Hello I'm getting this warning "Variable 'x1' might be set by a nonscaler operator".

You case x1, x2 are vectors and you cannot use the condition like that. You have to use like shown below. n = -5:5; A = 0.8...

9 dagar ago | 0