Find Number of rows

[ppal]

[ppal]

Maybe I can use this 

[Werner_E]

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@ppal wrote:

Maybe I can use this 

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Just for counting?

I guess this

would do the same job.

But you could use your approach to create the "thinned" data vector:

BTW I made a mistake in my previous answer. Its not necessary to use N-1 all the time.

I edited my post accordingly.

[Werner_E · Accepted solution]

You can't find the number of rows here because Data(i) actually is an invalid object, just good enough for display but nothing more.
It may look like a vector but it isn't.

Try to assign it a variable and you will see that you get an error.

What you do can be called a misuse of a range variable because ranges simply are not made for this (even though sometimes it might be convenient).

You may use a utility function which extracts every N-th value from a vector starting with its first value.
So you are dealing with vectors throughout and can use the "rows" function etc.

While I consider it less clear, you may also use an approach similar to the one you used with your range i:

If you insist on using your range i you could do it that way

but I definitely don't like this approach.

I also don't like the syntax "Data(i)" to access vector elements as it look likes a function but isn't. I prefer the "classic" vector/matrix index.