Preallocated array A using a for loop

2019 9 15
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Consider an iterative series 1, (-1)/2, 1/3, (-1)/4, 1/5,…(-1)^(k-1)/k. The first 5 terms for k=1:5 are written here. Create the first 100 and store them all in a preallocated array A using a for loop.
Please help with this question. Thanks in advance!

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madhan ravi
madhan ravi 2019-9-15

2 个投票

https://in.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html - you will see how to store values in each iteration through preallocation.

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timetry2
timetry2 2019-9-15
I did look through this already, however, I am still confused on how to exactly code it to do a for loop. Could you show me how the code itself would look like.
Thank you
madhan ravi
madhan ravi 2019-9-15
编辑：madhan ravi 2019-9-15
Just come up with the code , doesn’t matter if it’s right or wrong. We’ll correct the code once it’s constructed.
timetry2
timetry2 2019-9-15
编辑：madhan ravi 2019-9-15
Im unfamiliar with tic toc functions but here is the code I came up with:
tic
x = zeros (1,100);
for k = 1:5
x(k)=(-1)^(k-1)/k
end
toc
Please let me know what to fix and thanks for the help!
madhan ravi
madhan ravi 2019-9-15
Ignore tic toc , concentrate the length of k you are only calculating until 5 but the task asks you to do it till 100.
timetry2
timetry2 2019-9-15
编辑：Image Analyst 2019-9-15
So, would I just need to change k = 1:100 instead of k = 1:5?
So, the line of code would look like the following:
tic
x = zeros (1,100);
for k = 1:100
x(k) = (-1)^(k-1)/k
end
toc
timetry2
timetry2 2019-9-15
One last thing, what are the tic toc functions doing then? I've only learned about for and while loops. And, I was curious how this function works without incorporating either. Thank you so much for the help.

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