hi

x=1:7
n=-3:3

need y[n]=x[2n+3] ?

plz send me the answer " [e-mail] "

Answer 1

[Walter Roberson]

This is not possible in MATLAB, as MATLAB arrays cannot be indexed at negative numbers or 0, but you want to index y at -3, -2, -1, and 0, along with 1, 2, and 3.

[fadi rami]

YES WALTER I MEAN " the value when x=1 is -3 and when x=2 the value is -2 etc , and i need for this shape make scaling and shifting

Answer 2

[Geoff]

I think you mean this:

x = -3:3;
y = 2 * x + 3;
plot(x, y);

[fadi rami]

no man i mean " the value when x=1 is -3 and when x=2 the value is -2 etc , and i need for this shape make scaling and shifting

[Geoff]

So you mean:

x = 1:7;

y = -3:3;

Here, y is "the value when x=1 is -3... etc", and you access it like this: y(1)

[Geoff]

Alternatively, if you really did mean n = -3:3 and y = 2n + 3, then:

x = 1:7;

n = -3:3;

y = 2*n + 3;

Answer 3

[Image Analyst]

Don't forget to check your duplicate post in the newsgroup: http://groups.google.com/group/comp.soft-sys.matlab/browse_frm/thread/23153174886ed6bd?hl=en#

Answer 4

[Nourhan]

MATLAB does not allow negative or zero indices. MATLAB array indexing must start at 1

Answer 5

[atta]

y[n]=x[2n+3]

with x=[1,2,3,4,5,6,7] and n=−3:3.