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1x100 vector of all -1

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Zelda Luxenburry
Zelda Luxenburry 2012-3-15
评论： Tushar Chauhaan 2021-1-15
I can't find how to create a vector with dimensions 1x100 where all the values should be -1... i know you can use "zeroes" and "ones" but how do I do this for -1? I also need to make one for the value 2.00049. Thanks!

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回答（3 个）

Jan
Jan 2012-3-15
x = -ones(1, 100); % Faster than -1*ones(1, 100);
Inside repmat this happens:
a = -1;
x = a(ones(1, 100));
If x does not exist before or is not larger than the wanted result, this works also:
x(1:100) = -1;
But I recommend not to use this, because it depends on the history:
x = rand(11, 11);
...
x(1:100) = -1 % Still a [11 x 11] matrix!
Wayne King
Wayne King 2012-3-15
x = -1*ones(1,100);
y = 2.00049*ones(1,100);
Walter Roberson
Walter Roberson 2012-3-15
Alternative:
x = repmat(-1, 1, 100);
y = repmat(2.00049, 1, 100);

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