Matlab Programming for Engineering Analysis

case 10 grade= 'A' ; case 9 grade= 'A' ; case 8 grade= 'B' ; case 7 grade= 'C' ; case 6 grade= 'D' ; otherwise grade= 'F' ; end end end %% To run lg=switchletgrade(22) lg = X %%%% % Note: You can combine the first to cases as follows switch quiz case {10,9} grade= 'A' ; case 8 grade= 'B' ; %etc % Oftem, the otherwise clause is used for the error message %switcherror.m choice=input( 'Enter a 1, 3, or 5:' ); switch choice case 1 disp( 'It is a one!!' ) case 3 disp( 'It is a three!!' ) case 5 disp( 'It is a five!!' ) otherwise disp( 'You entered a wrong number!!' ) end %%% The Menu Function %The matlab has a built-in function called menu that will display a %Figure Window with pushbuttons for the options. The first string in the %list of function arguments is the heading (instruction), and the rest are %labels of option. The function returns the number of the buttom that is pushed. % For example, type in a command window: mypick=menu( 'Pick a pizza' , 'Cheese' , 'Shroom' , 'Sausage' ); %It will display a Figure Window. If you click on one of the buttom, %say, cheese, you'll get mypick mypick = 1 % A script that uses this menu function could then use either a switch or if- else %statement to take an appropriate action %pickpizza.m mypick=menu( 'Pick a pizza' , 'Cheese' , 'Shroom' , 'Sausage' ); switch mypick case 1 disp( 'Ordered a cheese pizza.' ) case 2 disp( 'Ordered a mushroom pizza.' ) case 3 disp( 'Ordered a sausage pizza.' ) otherwise disp( 'No pizza for us today.' ) end %%%% % The "IS" Function in Matlab %Many functions in Matlab test whether something is true or not, and they have names %that begin with the word "is" isletter( 'h' ) ans=1 %try above with 4, ans=0 mychar=input( 'Please enter a char:' , 's' ); if isletter(mychar) disp( 'It is a letter.' ) else disp( 'It is not a letter.' ) end %OR mychar=input( 'Please enter a char:' , 's' ); if isletter(mychar) fprintf( '%s is a letter.\n' ,mychar) else fprintf( '%s is is not a letter.\n' ,mychar) end % Another is-function is isempty evec=[]; isepmty(evec) ans=1 evec=[evec 12]; isepmty(evec) ans=0 %% istr=input( 'Please enter a string:' , 's' ); Please enter a string: isepmty(istr) ans=1 %%% If you want which keywords you shuld not use as a variable (identifier) %%% name, you can use the function iskeyword() iskeyword ans= 'break' 'case' %etc % You can also do this iskeywrd( 'sin' ) ans= 0 % Play with sin as a variable, but if you want to switch to sin(10) etc, first clear % all % so you could use sin, although there is a function sin iskeyword( 'switch' )

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