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y1 = x(2:n) ;
t1 = n*dt - (2*dt:dt:n*dt)
could anyone tell me what is the meaning of the these commands? The syntax of MATLAB, I mean, what does do x(2:n) and n*dt - (2*dt:dt:n*dt) ? x times (2:n)? and the second one sub an 4 dimension array from a scalar ?
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Thomas
2012-6-27
Eg.
x=1:20; %i.e x=1 2 3.... 20
n=5; % assign value of 5 to n
y1 = x(2:n) % get second to nth (5th )value in x and put it in y1
Output of above
y1 =
2.00 3.00 4.00 5.00
dt=1; %assign value of 1 to dt.. you can give any value
t1 = n*dt - (2*dt:dt:n*dt);
frist term n*dt %multiply n (scalar) by dt a scalar
n*dt
ans =
5.00
second term 2*dt:dt:n*dt % range twice dt to ntimes dt witht a difference of dt for above case 2*1:1:5*1 i.e (2:1:5)
2*dt:dt:n*dt
ans =
2.00 3.00 4.00 5.00
ti=sub first term (scalar) -second term (array) (5-2, 5-3, 5-4, 5-5)
t1 = n*dt - (2*dt:dt:n*dt)
t1 =
3.00 2.00 1.00 0
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