how to convert complex number into double number?

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I have got this complex value from result of an equation such :( 0.7803 + 0.0000i -0.3681 + 0.5659i 0.8562 + 0.0000i -0.8941 + 0.0428i 0.7861 + 0.0000i
0.0303 + 0.8492i 0.8508 + 0.0000i -0.5537 - 0.5875i 0.7910 + 0.0000i -0.7290 - 0.2247i)
i need to convert the result to double, How?
  8 Comments
David Hill
David Hill on 25 Jan 2022
We have no idea what you are trying to do. Some background would be helpful. You are obviously going to get complex results when cos(w) goes negative. You could force y to be positive by abs(cos(w)), but just like John said you cannot hide your head in the sand. We don't know what you are modeling or doing, so we can't help you.
Arshub
Arshub on 25 Jan 2022
@David Hill i need to implement this function in attached image to get sequence values for x and with initial value as in program......

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Accepted Answer

Walter Roberson
Walter Roberson on 25 Jan 2022
siz=256;
x=nan(1,siz+1); %<------------PREALLOCATE!!!
y=nan(1,siz+1); %<------------PREALLOCATE!!!
Z=0.78;% initial value of control parameter Z for cofusion
E=0.95;% initial value of control parameter E for cofusion
%u=1.58;% initial value for cofusion
x(1)=0.75;% initial value
y(1)=0.2963 ; %u*x(1)*(1-x(1));%y(1) 0.2963 initial value
for j=1:siz
r=(Z/y(j));
x(j+1)= sin(r).^(3/2);
w=(E*acos(x(j)));
y(j+1)=(cos(w));
end
plot(x, y)
  2 Comments
Arshub
Arshub on 25 Jan 2022
@Walter Roberson Thanks alot for your help, but all values not chaotic as auther of this function indicate in his paper, so i think there is something wrong.
Walter Roberson
Walter Roberson on 25 Jan 2022
Sorry, I do not know. I am not able to reproduce the authors' plots.

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