Fractions as array indices in for loop

1 visualizzazione (ultimi 30 giorni)
Stephan van Kalmthout
Stephan van Kalmthout il 11 Feb 2020
Commentato: Walter Roberson il 12 Feb 2020
Why isn't it possible to use fractions as array indices?
I know it won't work, but why doesn't it work and are there ways to work around this?
  3 Commenti
dpb
dpb il 11 Feb 2020
That's good insight to bring in the data aspect as perhaps the unstated but underlying question, Stephen... +1.3
Walter Roberson
Walter Roberson il 12 Feb 2020
Under your proposal, given an array with dimension 100, what location would 0.13 correspond to? 0.135? 1/7? 0? sqrt(2)? Would the fraction 3/6 be different than 6/12?
Would your answer about 0.13 change if you knew that in MATLAB, 0.13 has to be approximated by 0.13000000000000000444089209850062616169452667236328125 and so that if you just multiply the fraction by the length of the dimension then except for some special fractions, you do not generally end up with a nice integer?

Accedi per commentare.

Risposte (1)

dpb
dpb il 11 Feb 2020
Short answer? "Because!" TMW hath so decreed.
I'm sure it's mostly performance related as well as ease of code development and maintenance. Having to wrap every array access with a rounding operation would be a real performance bottleneck.
Undoubtedly other reasons as well...

Prodotti


Release

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by