Hi,

You will have to use some form of extra data to produce the step chart.
Here is some information on ways to create a step chart.
http://www.andypope.info/charts/stepchart.htm

Cheers
Andy

peter wrote:
I am trying to create from ordinary data graph whish looks like a digital
square shaped signal. Is there any function in Excel included which makes it
right away, instead of using repetition of each data cell twice?

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Andy Pope, Microsoft MVP - Excel
http://www.andypope.info