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Vectorized summation for vectorized indices

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Rajesh
Rajesh 2023-9-18
评论： Rajesh 2023-9-18
Hi, I need to write a code for the following summation. Thanks in advance.
Where k=1,2,3...... For example if one considers upto the summation becomes
where each and run as 1,2,3....... The second term of the summation indicates: for example if the values of =1 and =1 the terms inside the summation become . Here i and j run as 1,2,3......
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Dyuman Joshi
Dyuman Joshi 2023-9-18
What is X?
And I hope you realise that you are overwriting the variable sum1 with every iteration of the 2nd for loop without storing the values in any other variables.
Rajesh
Rajesh 2023-9-18
I understand your query but I don't need to store that. This is small portion of a big code. Ultimately, I need to use RK4 to solve the X. I'm generating those elements just by the above summation. If I get help to generalize the above summation for (with or without storing will not effect), my job is done.

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