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Help for a function which works like triu function in matlab

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Anastasia Kyriakou
Anastasia Kyriakou on 1 Mar 2020
Answered: Sai Sri Pathuri on 4 Mar 2020
we have seen the function triu(A,k) which extracts upper triangular part of A. But i have to write my own function with the header U = myTriu(A,k) which does the same thing and apply it with A= (2 5 6 4 8 9 10 15 12),k) where k=-2,-1,1
Could anyone help me,please?

  3 Comments

Steven Lord
Steven Lord on 1 Mar 2020
This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.
If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the MATLAB Onramp tutorial (https://www.mathworks.com/support/learn-with-matlab-tutorials.html) to quickly learn the essentials of MATLAB.
If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.
Anastasia Kyriakou
Anastasia Kyriakou on 1 Mar 2020
clc
clear all
close all
function U = myTriu(A,k)
for i=1:10
for j=1:10
if (i==1|| j==1 || i=10|| j=10
fprintf('i');
else fprintd('j');
end
end
end
I have written this but it does not seem to be correct
Anastasia Kyriakou
Anastasia Kyriakou on 1 Mar 2020
clear all
close all
function U = myTriu(A,k)
for (i=0 ; i<row; i++
{
for (j=0; j<col ;j++)
{
if (i>j)
{
matrix[i][j]=0;
}
count << matrix[i][j] << '' '' ;
}
count << end1
}
}

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Answers (1)

Sai Sri Pathuri
Sai Sri Pathuri on 4 Mar 2020
I think the first code you posted is not relevant to this question and the second code is written in C++ for k = 0 case.
You may use the following code which has a slight modification (checking for i + k > j) for all values of k
function U = myTriu(A,k)
for i = 1: size(A,1)
for j = 1:size(A,2)
if i + k > j
A(i,j) = 0;
end
end
end
U = A;
end

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