hi

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fadi rami
fadi rami 2012-3-26
x=1:7
n=-3:3
need y[n]=x[2n+3] ?
plz send me the answer " fadi.sam@live.com "

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回答（3 个）

Walter Roberson
Walter Roberson 2012-3-26
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.
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fadi rami
fadi rami 2012-3-26
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

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Geoff
Geoff 2012-3-26
I think you mean this:
x = -3:3;
y = 2 * x + 3;
plot(x, y);
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Geoff
Geoff 2012-3-26
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
Geoff 2012-3-26
Alternatively, if you really did mean n = -3:3 and y = 2n + 3, then:
x = 1:7;
n = -3:3;
y = 2*n + 3;

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Image Analyst
Image Analyst 2012-3-26
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#

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