Searching for a value in a column

Hi,

I have a column with incrementing data which occasionally resets to zero. How do I search the column and check that each value isn't smaller than the previous entry? From that point I can simply add the previous value to all future value to remove the zeroing error, but I can't figure out how to scan down the column.

Cheers

Answer 1

[Walter Roberson]

find(diff(YourColumn) < 0)

There might be a way to do your entire operation in one or two commands; it doesn't immediately come to mind, though.

[James]

Thanks Walter,

It's always a far simpler solution than you imagine!

[Teja Muppirala]

Here's one way to do it in one line:

x = [10 14 17 2 5 6 1 2 3]

x(1) + [0 cumsum( max(diff(x),0) + (diff(x) < 0).*x(2:end))]

[Walter Roberson]

Well done, Teja. I hadn't figured out a way to handle multiple zeroings; your code takes them in stride nicely.