Introduction to Scilab - Projects

cholcompanionconddetinvlinsolvelsqluqrrcondspecsvdtestmatrixtraceCholesky factorizationcompanion matrixcondition numberdeterminantmatrix inverselinear equation solverlinear least square problemsLU factors of Gaussian eliminationQR decompositioninverse condition numbereigenvaluessingular value decompositiona collection of test matricestraceFigure 23: Some common functions for linear algebra.5.1 The if statementThe if statement allows to perform a statement if a condition is satisfied. Theif uses a boolean variable to perform its choice: if the boolean is true, then thestatement is executed. A condition is closed when the end keyword is met. In thefollowing script, we display the string ”Hello!” if the condition %t, which is alwaystrue, is satisfied.if ( %t ) thendisp (" Hello !")endThe previous script produces:Hello !If the condition is not satisfied, the else statement allows to perform an alternativestatement, as in the following script.if ( %f ) thendisp (" Hello !")elsedisp (" Goodbye !")endThe previous script produces:Goodbye !In order to get a boolean, any comparison operator can be used, e.g. ”==”, ”>”,etc... or any function which returns a boolean. In the following session, we use the== operator to display the message ”Hello !”.i = 2if ( i == 2 ) thendisp (" Hello !")else34