how to shift position of an index of max value to origo in matlab?

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kat001
kat001 2018-6-13
编辑： kat001 2018-6-14
Hi, I would like to shift the position the maximum value so that the maximum value is at the center, i.e. at origo.
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kat001
kat001 2018-6-14
编辑：kat001 2018-6-14
Ok. But exactly how am I gonna do that? Because x has already the length of 13. It is 'mPos' is has a length of 12. How can I get the same vector lengths?
Adam
Adam 2018-6-14
Well, I haven't examined your code that closely to understand why mPos is only length 12, but presumably you know what the x values should be for it. why is it 12 instead of 13? Is it shifted by 1 or is it the middle of the other samples? (I assume the former judging by the plot). whichever it is, just give an x vector that matches - e.g. x(1:end-1) or x(2:end) or x(1:end-1) + diff( x(1:2) ) / 2 or whatever is appropriate.
As an aside, don'y use square brackets here:
x = [-3:0.5:3];
You should get an M-lint warning in the code highlighting this. The [] is un-necessary as well as being less efficient, not that efficiency matters here, but it's good to get into more efficient habits when they cost nothing.

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回答（2 个）

KSSV
KSSV 2018-6-13
x = [0 30 60] ;
y = [0 0.3 0] ;
plot(x,y);
xi = x-30 ;
yi = y-0.3 ;
hold on
plot(xi,yi)
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kat001
kat001 2018-6-13
Thank you. Now, imagine that x axis is not only bound to 0 to 60, instead it could be any length. How would I be able to feed that into the code in such case?

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kat001
kat001 2018-6-14
编辑：kat001 2018-6-14
Now, currently the plot looks like this:
where the red line represents an position vector as the power is increasing. What I would like to do is following (used MS paint for visualization) :
In other words, as the Gaussian profile reaches its maximum, the only way to keep maximum power all time by holding the position at the same place. And I am stuck with the coding here.
So far, my code looks like this:
x = -3:0.1:3;
norm = normpdf(x,0,1);
m = 0;
mPos = zeros(length(norm),1);
for i = 2:length(norm)
if(norm(i)>norm(i-1))
m = m + 0.1;
else
m = m - 0.1;
end
mPos(i) = m;
end
plot(x, mPos, 'r')
hold on
plot(x, norm, 'b')
grid on
hold off

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