If you understand the definition of a mathematical function, a good way to judge it is that any line drawn parallel to the y-axis intersects with the values in the function’s curve only once. The same ...

In this tutorial, we will explain how to make a Step Chart in Microsoft Excel. Charts are known to many as a graphical representation of data that people can use to explain a point to their audiences.

I just tried this. Select all the data you want to have graphed, click on Insert, pick line graph, and choose which one you want. Excel (2007) automagically grouped date and time on the X axis. Edit: ...