I want to change the "for loop" statement to a vectorizing code, but I've been stuck with this problem for many days, help!
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I have heard that a vectorized version code is more efficient than a code written with " for-loop statement" when executing some math calculation, but I am not very familiar with Matlab's vectorized code writing style, is there any kind person willing to help to change the following code into a vectorized style code, or provide some tips for me, thank you very much !
Here is the mathmaetical expression that I want to calculate, denoted by sum1 and sum2
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1366744/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1366749/image.png)
Here is Mycode
//c, h, g, e are all vector, here is their definition in my code.
c=zeros(q+1,1);
e=zeros(q+1,1);
h=zeros(q+1,1);
g=zeros(q+1,1);
....
// the part that i want to modify as vectorized code.
sum1=0;
sum2=0;
if(n>1)
for i=1:n-1
s=0;
for j=0:n-1-i
s=s+c(n-i-j+1)*(n-i-j)*h(j+1)-c(n-i-j)*h(j+2)*(j+1);
end
for j=0:n-i
s=s-h(n-i-j+1)*h(j+1)*i;
end
sum1=sum1+s*g(i+1);
end
for j=1:n-1
sum2=sum2+g(1)*(c(n-j+1)*(n-j)*h(j+1)-c(n-j)*h(j+2)*(j+1));
end
end
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回答(1 个)
Bhanu Prakash
2023-5-13
Hi Shelton,
As per my understanding, you want to vectorize "for" loop in the given code.
To vectorize the "for" loops in a given code, you can use the "coder.loop.vectorize" function. Consider the code shown below:
% creating a 10x1 matrix with random values
x=rand(10,1);
% creating a 10x1 zero matrix to store the output
y=zeros(10,1);
for i=1:length(x)
% vectorizing the "for" loop
coder.loop.vectorize
y(i)=sin(x(i));
end
The function "coder.loop.vectorize" is applied to the loop for calculating the output "y", resulting in a vectorized implementation.
For more information on the "coder.loop.vectorize" function, you can refer to the following documentation:
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