how to write a script for multiplication table

Question

0 个投票

I am wondering how to write a script that will print a multiplication table that looks like this: 1 2 4 3 6 9 4 8 12 16 5 10 15 20 25

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Adam 2015-10-28

What is the logic behind the sequence? Once you define that the rest is quite simple with

doc sprintf

to print out the numbers in whatever format you choose.

Ellis Fredella 2015-10-28

I need to use a for loop to do it, that's a great shortcut though.

Answer 1

Markus Pichler 2015-10-28

0 个投票

it seems that the sequence contains all the multiples of integers up to the square, i.e., in other form

1
2 4
3 6 9
4 8 12 16
5 10 15 20 25
and so forth

it will probably be more efficient with a loop, but you can also try

N = 5;
ix = [1:N].';
v = ix*ix.';
v(ix(:, ones(N, 1))<=ix(:, ones(N, 1)).').'

which throws away nearly half of the elements after generation

Ellis Fredella 2015-10-28

yeah, I need to use a loop in order to answer the question in the most efficient way. Thanks though!