lecture01 - Lecture 1 – Working with Data Prof Michael T...

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Lecture 1 – Working with Data Prof. Michael T. Heath Department of Computer Science University of Illinois at Urbana-Champaign [email protected] January 18, 2016
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2 Objectives Understand the what, when, who, why, where, and how of data! I What are data? I How are data represented? I How can we manipulate and understand data? I How can we make decisions based on data?
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3 Example: ID Card or Driver’s License What kinds of data does it contain? I name — character string I id number — number (or is it?) I date of birth — numbers I height and weight — numbers I eye color — character string I photo — two-dimensional array of pixels The data values for a given item (in this case a person) form a one-dimensional array or list, (which in this case is heterogeneous) A one-dimensional array of numbers is called a vector
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4 Aggregating Data A collection of data is often organized as a two-dimensional array with data values in rows and columns, as in a spreadsheet
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