Not able to figure out the way to deal with large vectors

Question

Bhaskar 2023-7-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1998338-not-able-to-figure-out-the-way-to-deal-with-large-vectors

编辑： Harsh Kumar 2023-7-20

采纳的回答： Harsh Kumar

Hi ,

I was doing problem and faced a issue how to deal with large vectors .

I have a function

x(n) = e0.1n [u (n + 5) – u (n − 10)]

and want to fetch the even and odd components of it to perform some operations over them .The issue i am computing them by iterating through the since to get access of the values and checking if it is odd or even and perform operation right away there.But it might be too silly to use when 'n' value goes very high .

can anyone suggest any good way for that ? Here is the Pseduo code

n=-10:1:10;

for loop

%%cheking the conditions if the current x(n)

%%value is odd or even and performing operations there only .

end

%%plot the parts

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Answer 1

Harsh Kumar 2023-7-20

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https://ww2.mathworks.cn/matlabcentral/answers/1998338-not-able-to-figure-out-the-way-to-deal-with-large-vectors#answer_1276008

编辑：Harsh Kumar 2023-7-20

在 MATLAB Online 中打开

Hi Bhaskar ,

I understand that you are looking to compute the odd and even parts of a function optimistically in MATLAB .

To achieve this, you can use the vector definition of function and use the theoretical definition of odd/even function to compute them optimistically .

Odd= (func(x)-func(-x))/2

Even= (func(x)+func(-x))/2

Refer to the below code snippet for better understanding .

n=-50:1:50;

func1=exp(0.1*n).*((n>=-5)-(n>=10)); % orginal function

func2=exp(-1*0.1*n).*((n<=5)-(n<=-10)); %conjugate function

odd=(func1-func2)/2; %odd function calculated using given formula

even=(func1+func2)/2; %even function calculated using given formula

stem(n,odd);

figure();

stem(n,even);

Refer to the documentation for more details on vector operations :https://in.mathworks.com/help/stateflow/ug/operations-for-vectors-and-matrices.html

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Answer 2

KSSV 2023-7-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1998338-not-able-to-figure-out-the-way-to-deal-with-large-vectors#answer_1275993

在 MATLAB Online 中打开

n=-10:1:10;
c1 = 0 ; c2 = 0 ; 
E = zeros([],1) ;
O = zeros([],1) ; 
for i = 1:length(n)
    %% Get your x(n)
    if mod(x(n))
        c1 = c1+1 ; 
        % Odd do your calculations
        % save the value 
        O(c1)=val ; 
    else
        c2 = c2+1 ; 
        % even do your calculation
        % save the value 
        E(c2) = val ;
    end
end
%%plot the parts
plot(E,'r')
hold on
plot(O,b) 