How to display my answer with out rewriting them?

Hello all,

I have my code below that finds the min_max of my function.

I would like for it to displapy all the min_max.

When i run the code it only does the last min_max.

How would I stop it from overwiting the previous min_max?

 x = 0:0.1:10;
 y = x.^(101/100)+4*cos((3*pi*x)/4)-2*sin((2*pi*x)/3)-0.25;

function minmax_ind = min_max(y)
for i = 2:(length(y)-1) 
    
     if (y(i-1) > y(i)) && (y(i+1) > y(i)) % if this is true, we have found a local minimum
        minmax_ind  = i;
     elseif  (y(i-1) < y(i)) && (y(i+1) < y(i)) % if this is true, we have found a local maximum
        minmax_ind = i;
     end 
end 

end

Thank you,

Nick

Answer 1

[Robin Kirsch]

You are overwriting minmax_ind every time. If you find a local max, you will overwrite it if you find another one. I hope this is what you meant, I did not test the function due to it being correct by finding the min and max of the array.

You can fix this if u add another variable just like this

function minmax_ind = min_max(y)
    j = 1;
for i = 2:(length(y)-1) 
     
     if (y(i-1) > y(i)) && (y(i+1) > y(i)) % if this is true, we have found a local minimum
        minmax_ind(j)  = i;
        j = j +1;
     elseif  (y(i-1) < y(i)) && (y(i+1) < y(i)) % if this is true, we have found a local maximum
        minmax_ind(j) = i;
        j = j +1;
     end 
end 
end

[Nicholas Deosaran]

Hey Robin,

Thank you for reply!

I ran the code with your fix and it's give me differnt numbers than I had before?