This program isn't working.

The program turns a point left or right by 60 degrees and moves it forward based on the commands you input. L = Counter Clockwise turn, R = Clockwise turn. If its F it moves forward by 1 unit in the current direction of theta. So an input is from a recursion formula that gives LRRLFLFRF and stuff life that. Here is the code. I just don't see why I am getting the wrong coordinates out to the N by 2 array storing the new coordinates. It only stores a new coordinate if it's an F command. Anyway heres my code. Please help.

function [ coords ] = myKochPts( commands )

theta = 0;
dim = 1;
pos = [0 0];

for i = 1:length(commands)
    if commands(i) == 'F' 
        dim = dim + 1;
    end
end

      coords = zeros(dim,2);

for j = 1:length(commands)

              if commands(j) == 'L'

                  theta = myLeft(theta);

              elseif commands(j) == 'R'

                  theta = myRight(theta);

              else

                  pos=myForward(pos,theta);
                  coords = [coords;pos];

              end     

end

end

function [ newPos] = myForward(curPos,curTheta)

origin = [0,0];
newPos = origin + [(curPos(1) + cos(curTheta)) , (curPos(2) +sin(curTheta))];

end

function [ newTheta ] = myLeft( curTheta)

newTheta = curTheta + pi/3;

end

function [ newTheta ] = myRight( curTheta)

newTheta = curTheta - (pi/3);

end

[Peter]

Quick update!!

I am getting the correct output but it is putting a BUNCH of 0's in the beginning.

ans =
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
         0         0
    1.0000         0
    1.5000    0.8660
    2.0000         0
    3.0000         0
    3.5000    0.8660
    3.0000    1.7321
    4.0000    1.7321
    4.5000    2.5981
    5.0000    1.7321
    6.0000    1.7321
    5.5000    0.8660
    6.0000    0.0000
    7.0000    0.0000
    7.5000    0.8660
    8.0000    0.0000
    9.0000    0.0000

[Peter]

I realized it's because I have the iteration set to the length of the commands array. So how do I make it so it doesn't add the 0s in the beginning?

Answer 1

[per isakson]

See: I need to learn the Debugger - is there a good tutorial on the net

.

Try to change

    coords = zeros(dim,2);

to

    coords = zeros(0,2);

I guess dim is the number of rows with zeros at the beginning.

Answer 2

[Peter]

HAHAHHAHAHAHAHAHAHHAHA THAT'S IT!!!!!!!! OMG THANK YOU!!!!!!!!!!!!!!!!!!!!!!!!!