Octave x-value of a minimum y
I am trying to discern what the x-value of my minimum y is in a simple function I input into octave. I have the minimum y, and I could go back and search for what x gave that y, but I'm trying to make it display the coordinates in one go. I'm certain there's in easy way to go about it, but I'm definitely missing something. Here's the function:
%W1
%function W=kopt(R,k);
R=3;
k=[0:0.001:3];
F=(-0.5*k.^2)+(k.^2-k-(R.^(-1))*(1+k.*R).*(e.^(-2*k.*R)).+k.*(k.-2).*
(1+k.*R).*e.^(-k.*R))./(1+(e.^(-k.*R)).*(1+k*R+(k.^2)*(R.^2)/3));
W=F+1/R;
plot(k,W)
min(W)
Thanks for the help!
octave minimum
asked Nov 25 '18 at 19:41
GalencrawGalencraw
11
add a comment |
I am trying to discern what the x-value of my minimum y is in a simple function I input into octave. I have the minimum y, and I could go back and search for what x gave that y, but I'm trying to make it display the coordinates in one go. I'm certain there's in easy way to go about it, but I'm definitely missing something. Here's the function:
%W1
%function W=kopt(R,k);
R=3;
k=[0:0.001:3];
F=(-0.5*k.^2)+(k.^2-k-(R.^(-1))*(1+k.*R).*(e.^(-2*k.*R)).+k.*(k.-2).*
(1+k.*R).*e.^(-k.*R))./(1+(e.^(-k.*R)).*(1+k*R+(k.^2)*(R.^2)/3));
W=F+1/R;
plot(k,W)
min(W)
Thanks for the help!
octave minimum
asked Nov 25 '18 at 19:41
GalencrawGalencraw
11
add a comment |
I am trying to discern what the x-value of my minimum y is in a simple function I input into octave. I have the minimum y, and I could go back and search for what x gave that y, but I'm trying to make it display the coordinates in one go. I'm certain there's in easy way to go about it, but I'm definitely missing something. Here's the function:
%W1
%function W=kopt(R,k);
R=3;
k=[0:0.001:3];
F=(-0.5*k.^2)+(k.^2-k-(R.^(-1))*(1+k.*R).*(e.^(-2*k.*R)).+k.*(k.-2).*
(1+k.*R).*e.^(-k.*R))./(1+(e.^(-k.*R)).*(1+k*R+(k.^2)*(R.^2)/3));
W=F+1/R;
plot(k,W)
min(W)
Thanks for the help!
octave minimum
asked Nov 25 '18 at 19:41
GalencrawGalencraw
11
I am trying to discern what the x-value of my minimum y is in a simple function I input into octave. I have the minimum y, and I could go back and search for what x gave that y, but I'm trying to make it display the coordinates in one go. I'm certain there's in easy way to go about it, but I'm definitely missing something. Here's the function:
%W1
%function W=kopt(R,k);
R=3;
k=[0:0.001:3];
F=(-0.5*k.^2)+(k.^2-k-(R.^(-1))*(1+k.*R).*(e.^(-2*k.*R)).+k.*(k.-2).*
(1+k.*R).*e.^(-k.*R))./(1+(e.^(-k.*R)).*(1+k*R+(k.^2)*(R.^2)/3));
W=F+1/R;
plot(k,W)
min(W)
Thanks for the help!
octave minimum
octave minimum
asked Nov 25 '18 at 19:41
GalencrawGalencraw
11
asked Nov 25 '18 at 19:41
GalencrawGalencraw
11
asked Nov 25 '18 at 19:41
GalencrawGalencraw
11
asked Nov 25 '18 at 19:41
GalencrawGalencraw
11
asked Nov 25 '18 at 19:41
GalencrawGalencraw
11
11
add a comment |
add a comment |
1 Answer
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min can return the index of the minimum value:
> [minval, iminval] = min(W)
minval = -0.31700
iminval = 981
> k(iminval)
ans = 0.98000
So after plot(k, W), you could do
[minval, iminval] = min(W);
hold()
plot(k(iminval), minval)
answered Nov 25 '18 at 19:49
Warren WeckesserWarren Weckesser
69.7k7100135
add a comment |
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1 Answer
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1 Answer
1
active
oldest
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active
oldest
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active
oldest
votes
min can return the index of the minimum value:
> [minval, iminval] = min(W)
minval = -0.31700
iminval = 981
> k(iminval)
ans = 0.98000
So after plot(k, W), you could do
[minval, iminval] = min(W);
hold()
plot(k(iminval), minval)
answered Nov 25 '18 at 19:49
Warren WeckesserWarren Weckesser
69.7k7100135
add a comment |
min can return the index of the minimum value:
> [minval, iminval] = min(W)
minval = -0.31700
iminval = 981
> k(iminval)
ans = 0.98000
So after plot(k, W), you could do
[minval, iminval] = min(W);
hold()
plot(k(iminval), minval)
answered Nov 25 '18 at 19:49
Warren WeckesserWarren Weckesser
69.7k7100135
add a comment |
min can return the index of the minimum value:
> [minval, iminval] = min(W)
minval = -0.31700
iminval = 981
> k(iminval)
ans = 0.98000
So after plot(k, W), you could do
[minval, iminval] = min(W);
hold()
plot(k(iminval), minval)
answered Nov 25 '18 at 19:49
Warren WeckesserWarren Weckesser
69.7k7100135
min can return the index of the minimum value:
> [minval, iminval] = min(W)
minval = -0.31700
iminval = 981
> k(iminval)
ans = 0.98000
So after plot(k, W), you could do
[minval, iminval] = min(W);
hold()
plot(k(iminval), minval)
answered Nov 25 '18 at 19:49
Warren WeckesserWarren Weckesser
69.7k7100135
edited Nov 25 '18 at 19:55
answered Nov 25 '18 at 19:49
Warren WeckesserWarren Weckesser
69.7k7100135
answered Nov 25 '18 at 19:49
Warren WeckesserWarren Weckesser
69.7k7100135
answered Nov 25 '18 at 19:49
Warren WeckesserWarren Weckesser
69.7k7100135
69.7k7100135
add a comment |
add a comment |
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