This program isn't working.

Question

Peter 2014-2-22

0
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https://ww2.mathworks.cn/matlabcentral/answers/118214-this-program-isn-t-working

回答： Peter 2014-2-22

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

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Peter 2014-2-22

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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