MATLAB: Function for Script. I need to write a Function that selects the positive and negative numbers from a matrix. How to write this

function;scriptmatrixnegativepositive

I need to write a Function that selects the positive and negative numbers from a matrix. How to write this?

Best Answer

function [p,n]=splitsigns(x)
% return positive/negative values from array x in vectors p/n, respectively
p=x(x>0);
n=x(x<0);

This one excludes 0; pick where you want those if do...

Related Solutions

MATLAB: Write a function ShowPrimes(n) that will find all prime numbers between 1 and n and return them as a vector. Do this using a for loop. Hint: use isprime(x) to check whether x is a prime number. As an example, >> primes=ShowPrimes(20) primes =

Hello,

The idea is that you use isprime to check is this prime or not.

Then, if it is the prime, you store the value of "i" (not isprime(i)) to the output.

MATLAB: Create a function to…

It's not bad actually. The lines

 positive=positive
 negative-negative

are useless, and you want to create vectors of sums, not scalars. So one mistake is that you don't index variables positive and negative with the row index. To make it more efficient, you could even prealloc these variables: change

 positive=0;
 negative=0;

for

 positive = zeros(size(x, 1));
 negative = zeros(size(x, 1));

Another mistake is that k and j should go from 1 to the number of rows and columns of x. You can obtain them using function SIZE.

Best Answer

Related Solutions

MATLAB: Write a function ShowPrimes(n) that will find all prime numbers between 1 and n and return them as a vector. Do this using a for loop. Hint: use isprime(x) to check whether x is a prime number. As an example, >> primes=ShowPrimes(20) primes =

MATLAB: Create a function to…

Related Question