MATLAB: How to use for Loop and if statement to construct a Pythagorean triple function

for looploop

I am working on construct a Pythagorean triple functions with inputs (a,b,c). Function: a^2+b^2=c^2

I am confused when the Matlab reminds me of NOT ENOUGH INPUT ARGUMENT. Should I initialize a,b,c? Besides I need use loop and if statement to check a,b,and c are all positive.

This is what I have written:

function [ Pyth] = isPythag( a,b,c )

d =a.^2+b.^2-c.^2; [row,column]=size(d);

for i=1:row for j=1:column if (d(i,j)==0) pyth(i,j)=1; else pyth(i,j)=0; end end end end

Best Answer

Is the aim of your function simply to determine whether a, b, and c form a Pythagorean triple?

If so then yes you need to intialise them and pass 3 arguments to your isPythag function...e.g.

isPythag( 3, 4, 5 ) % True
isPythag( 4, 5, 6 ) % False

You don't need a for loop though unless you intend to pass in vectors of a, b and c and even then you can vectorise rather than use a for loop to give multiple answers.

You also need to be consistent with capitalisation or not of variable names.

'pyth' is a different variable to the 'Pyth' output variable your function expects.

Related Solutions

MATLAB: Simple program but wrong output

After you swap point 3 down to point 2, you need to figure out whether it then needs to be swapped down to point 1. Consider for example, [6 5 4] then your first operation would swap to [5 6 4] and your second operation would swap that to [5 4 6] but you need to compare that 5 and 4.

MATLAB: Pythagorean triples up to Z without loops

Instead of ‘meshgrid’ I would suggest using ‘ndgrid’:

   [a,b,c] = ndgrid(1:Z);
   A = [a(:),b(:),c(:)];
   t = A(:,1).^2+A(:,2).^2==A(:,3).^2;
   A = A(t,:);

Note: Using a well thought-out for-loop would probably be much faster and use less memory.

Best Answer

Related Solutions

MATLAB: Simple program but wrong output

MATLAB: Pythagorean triples up to Z without loops

Related Question