Monday, February 21, 2011

Excel: Theory

=lookup is look up function. Simple formula is (This , Here)
All formulas have brackets, and commas.
Do Not highlight titles when you highlight lists.
Type name to replace number you must press enter otherwise it won't confirm. e.g B3 to Marks, ENTER.

=countif is a counting function. Simple formula is (In this list , Count how many..)

Sunday, February 20, 2011

Excel

import: .csv = Comma Separated Values, Is a standardized format so it can be read by everyone.

Absolute and Relative references = A1 is a cell reference = Relative References: When the formula changes  when you copy paste. Absolute cell referencing will absolutely always refer to that cell even if you copy and paste.

Named Cells = A named cell is an absolute reference. Another way of doing absolute reference.

Named Range = Naming a range of cells e.g Class Marks. Is an automatic relative reference. Makes reading formulas easy.

Sum, Average, Maximum, Minimum, Integer, Rounding Counting, If, Look up.

Filtering AND, OR, NOT, LIKE - is like a Google search, cuts down options.

Wildcard - actually is a star when your searching, is kind of like the word anything. Broadens searches.


IMPORTANT!!! - ALWAYS SAVE AS EXCEL WORKBOOK

Wednesday, February 9, 2011

Software & Hardware & Components

Software: a set of commands processed for an output
   e.g        utility software is used to change the system
               operating system
               applications
http://en.wikipedia.org/wiki/Software

Hardware: Physical components in a system
http://en.wikipedia.org/wiki/Hardware

CPU (central processing unit)      

RAM(Random Access Memory)(continuosly changes)(holds whats going on right now)(Volitile)(Green)

ROM(Read Only Memory)(Black)(non-volitile)