crazy loop
crazy loop
(OP)
Hi Guys
Have a look at the following simple matlab code:
x=[1;2;3;4;5;6;7;8;9;10];
y=[5;4;3;6;7;8;5;4;3;2];
z=[1;2;-7;-4;5;-1;4;-9;-6;5]
x1 = zeros(m, 1);% initialise output matrix
y1 = zeros(m, 1);
z1 = zeros(m, 1);
for i = 1:m;
x1(i) = x(i);
y1(i) = y(i);
z1(i) = z(i);
if z1(i)<0 % to choose the negative elements
if z1(i+1)>0 % if the next element is positiv
plot(x(i),y(i),'o')
hold on
end
end
end
------------------
I want to plot x versus y when z sign change from negative to positive ( z passes through zero). Matlab does not consider the second loop where I try to examine the following element. The answer is probably easy and silly but I spent few days without any success.
Any idea or suggestion??
Help is greatly appreciated.
Regards
Star
Have a look at the following simple matlab code:
x=[1;2;3;4;5;6;7;8;9;10];
y=[5;4;3;6;7;8;5;4;3;2];
z=[1;2;-7;-4;5;-1;4;-9;-6;5]
x1 = zeros(m, 1);% initialise output matrix
y1 = zeros(m, 1);
z1 = zeros(m, 1);
for i = 1:m;
x1(i) = x(i);
y1(i) = y(i);
z1(i) = z(i);
if z1(i)<0 % to choose the negative elements
if z1(i+1)>0 % if the next element is positiv
plot(x(i),y(i),'o')
hold on
end
end
end
------------------
I want to plot x versus y when z sign change from negative to positive ( z passes through zero). Matlab does not consider the second loop where I try to examine the following element. The answer is probably easy and silly but I spent few days without any success.
Any idea or suggestion??
Help is greatly appreciated.
Regards
Star





RE: crazy loop
x=[1;2;3;4;5;6;7;8;9;10];
y=[5;4;3;6;7;8;5;4;3;2];
z=[1;2;-7;-4;5;-1;4;-9;-6;5]
m = size(x, 1);
x1 = zeros(m, 1);% initialise output matrix
y1 = zeros(m, 1);
z1 = zeros(m, 1);
for i = 1:m;
x1(i) = x(i);
y1(i) = y(i);
z1(i) = z(i);
if z1(i)<0 % to choose the negative elements
if z1(i+1)>0 % if the next element is positiv
plot(x(i),y(i),'o')
hold on
end
end
end
RE: crazy loop
CODE
CODE
Something like this should solve the problem.
CODE
if (z1(i-1)<0 & z1(i)>0)
plot(....)
end
end
RE: crazy loop
That really works nicely.
Well done!!!!