how can i mark a minimum point on function plot by using fplot/ezplot comman

y =

12753764076615830083770010361727/(158456325028528675187087900672*x^2) + (14262200079559523*x^2)/140737488355328

i am plotting it with respect to x

please help

Answer 1

[Walter Roberson]

Suppose you have calculated the positions of the extrema and stored them in pos_extrema, and stored the y value at that minima in miny, then:

>> fplot(y,[-2 2])
>> hold on
>> fplot(miny, double(pos_extrema(1))+[0 0], 'r*')
>> fplot(miny, double(pos_extrema(2))+[0 0], 'r*')
>> hold off

Hint: there are four positions where y have identical minima. Two of those locations are at complex-valued x -- so there are two real-valued x with the same minima.

You should be able to deduce more about the nature of the positions from the fact that you have x^2 in the formula but not x.

[manish kumar]

position of the minimum point in my case is (o.9446,180.672). please write code for this mark.

[Walter Roberson]

miny = 180.672;
pos_extreme(1) =0.9446;
pos_extreme(2) = -0.9446;

Now use the code I posted.

[manish kumar]

yes it works thank you sir!