1x0 emtpy double row vector?

What does 1x0 empty double row vector mean?

When I do this operation 0:0.1, matlab turns 0 as a result.

But why does 1:0.1 turn 1x0 empty row vector? Should it not 1 since the operation will just give the first element, that is 1 but will not create others as uniformly spaced elements?

Answer 1

[Rishik Ramena]

If j > k, then x = j:k is an empty matrix.

You might want to go through the documentation for colon operator.

Answer 2

[Sriram Tadavarty]

Hi Metin,

In MATLAB, the colon operator indicates the range of values that are used for an operation.

lowestNum:HighestNum is the general usage.

In the case of 0:0.1, the lowest number is 0, the step size is 1 (by default) and the last number is 0.1. Since, its a valid range, the value of 0 is printed.

In case of 1:0.1, the lowest number is 1, the step size is 1 (by default) and last number is 0.1. Since, 1 cannot be made to 0.1, with a step size of 1, the value returned is empty.

You can try 1:-1:0.1, then the first value of 1 is printed, since there is a step size of -1 and it can go near 0.1.

For more information about colon operator, look here.

Hope this helps.

Regards,

Sriram