creating a 8x8 matrix with only -1

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Aimee
Aimee 2024-10-27
评论： Aimee 2024-12-10
i want to create a 8x8 matrix withn only the number -1 how do i do it?

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回答（3 个）

Torsten
Torsten 2024-10-27
移动：Torsten 2024-10-27
Use "ones" to build a matrix of ones and multiply it by (-1).
  1 个评论
Walter Roberson
Walter Roberson 2024-10-28
You have to be careful to build up the 8 x 8 size for the ones() call, out of pure -1's. It is certainly possible to do.

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埃博拉酱
埃博拉酱 2024-10-28
编辑：埃博拉酱 2024-10-29
-ones(8)
Append at 20241029 as a Cody challenge:
rand(single('('-' '))
%You don't even need -1 in your code. This can be applied to any challenge that has a limit on the number that appears in the code.
%If you're okay with using characters that aren't on your keyboard, you can even just use a Backspace character (U+0008).
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Walter Roberson
Walter Roberson 2024-10-29
Ran in:
@DGM
The + are not needed
A = -ones((-1 -1 -1 -1)*(-1 -1))
A = 8×8
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
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DGM
DGM 2024-10-29
D'oh!
I must have had my blinders on when I was coming up with that.

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Aimee
Aimee 2024-10-29
hey guys thanks for all the help i got it eventuallyt with the code A = -ones(8,8). just incase anyone sees this and need help in the future.
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DGM
DGM 2024-10-30
编辑：DGM 2024-10-30
As a counterexample, "create fire with only flint and steel" typically does not imply that the fire contains either flint or steel. Maybe we're all wrong to be creating a matrix full of -1.
Aimee
Aimee 2024-12-10
no youre correct i wanted an 8x8 matrix where the only elements were -1 i managed it eventually with the formula i used above though.

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