Storing decimal numbers in for loop: getting a single vector

2014 2 25
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更新时间：2014 2 25
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I want to store decimal numbers in the for loop.
for e = 0:0.1:1
k = sqrt(2.*e);
q = sqrt(2.*(e+(V0./2)));
r = sqrt (2.*(e+V0));
a = ((r+q+(2.*s1.*lambda)).*(k+q+(2.*s1.*lambda)).*expm(s1.*(r-q).*0.48)) - ((r-q+ (2.*s1.*lambda)).*(k-q+2.*s1.*lambda).*expm(s1.*(r+q).*0.48));
Trans = (4.*k.*q)./a;
wfn = Trans.*conj(Trans);
posit1(e,1) = e;
wfn1(e,1) = wfn;
end
plot( posit1, wfn1);
I want to store all the values from 0 to 1 with an interval of 0.1 Please help me how to do it??

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 采纳的回答

Mischa Kim
Mischa Kim 2014-2-25
编辑：Mischa Kim 2014-2-25

0 个投票

Parikshit, you cannot use non-integer indices (such as 0.1) to access or write to a matrix. Also, indexing in MATLAB starts with 1, not 0. Instead, use
...
e = 0:0.l:1;
for ii = 1:length(e)
k = sqrt(2.*e(ii));
q = sqrt(2.*(e(ii)+(V0./2)));
r = sqrt(2.*(e(ii)+V0));
a = ((r+q+(2.*s1.*lambda)).*(k+q+(2.*s1.*lambda)).*expm(s1.*(r-q).*0.48)) - ((r-q+ (2.*s1.*lambda)).*(k-q+2.*s1.*lambda).*expm(s1.*(r+q).*0.48));
Trans = (4.*k.*q)./a;
wfn = Trans.*conj(Trans);
posit1(ii) = e(ii);
wfn1(ii) = wfn;
end
Some other suggestions:
  • Instead of accessing e(ii) time and again in the loop, you could do a e_ii = e(ii) as the first line in the loop, and then use e_ii throughout the loop.
  • Especially for large matrices you would want to pre-allocate. That is, put
posit1 = zeros(length(e),1);
wfn1 = zeros(length(e),1);
in front of the for-command.

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