how to convert complex number into double number?

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Arshub 2022-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/1635355-how-to-convert-complex-number-into-double-number

评论： Walter Roberson 2022-1-25

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?

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David Hill 2022-1-25

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 2022-1-25

@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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Walter Roberson 2022-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/1635355-how-to-convert-complex-number-into-double-number#answer_881230

在 MATLAB Online 中打开

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)

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Arshub 2022-1-25

@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.