Why is pre-allocating done?
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S Priya
am 30 Jun. 2021
Kommentiert: S Priya
am 30 Jun. 2021
In a program why is pre-allocating done?for example using arrays of zeros
ex- A=zeros(3)
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Yongjian Feng
am 30 Jun. 2021
Hello Priya,
This is more like setting default values. Just in case, they are not set in some code paths, the default values will be there.
Thanks,
Yongjian
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Steven Lord
am 30 Jun. 2021
Imagine you were building a home. Which would be preferable?
- Buy a lot large enough to build the entire home.
- Build the bathroom.
- Build the bedroom.
- Build the kitchen.
- etc.
or
- Buy a lot large enough to build the bathroom.
- Build the bathroom.
- Buy a new lot large enough to hold the bathroom and a bedroom.
- Move the bathroom to the new lot.
- Build the bedroom.
- Buy a new lot large enough to hold the bathroom, a bedroom, and a kitchen.
- Move the bathroom and the bedroom to the new lot.
- Build the kitchen.
- etc.
Moving a building is hard. Ideally you don't do it, or you do it as few times as you can.
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