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lecture18_slides - Overview of today Today Review of...

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Overview of today Today: Review of concepts from last time Matrix functions and conditional statements conditional statements For and While loops in Matlab Statistical measures for differential gene expression
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Conditional statements How do we control the flow of a program based on the state of the variables? if, else, elseif statement if condition1 <do-something-here> elseif condition2 <do-something-here> else <do-something-here> end (any number of elseif‟s can be used, either 1 or 0 else‟s can be used) Matlab expects elseif but Perl uses elsif. Matlab does not accept { } to wall statements in. Entire chain of if-elseif- else must end with “end”. Perl requires { } around each group of statements.
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Conditions How do we express conditions? For 1x1 number variables (ie, scalars): a==b, a > b, a < b, a >= b, a <= b, a ~= b What is a condition? A condition is an expression that is valued at either true or false. (Basically, it‟s a “yes” or “no” question.) You can assign this value to another variable: Matlab uses ~= for “not equal”. Perl uses != or ne. is_3_equal_to_4 = 0 is_3_less_than_4 = 1 conditionals.m
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Conditional statements How do we control the flow of a program based on the state of the variables? if, else, elseif statement if ( condition ) <do-something-here> elseif <do-something-here> else <do-something-here> end (any number of elseif’s can be use, either 1 or 0 else’s can be used) Matlab expects elseif but Perl uses elsif. Matlab does not accept { } to wall statements in. Entire chain of if-elseif- else must end with “end”. Perl requires { } around each group of statements.
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