The variable in CONDITIONAL_EXPR must be assigned a new value in the expressions within the loop body. The CONDITIONAL_EXPR in the while command must include at least one variable and this variable must have assigned a value before the while is executed for the first time. The program keeps repeating this way until x = 16 and stops because 16 <= 10 returns false. Next the program goes back to check whether x <= 10 which is still true ( 2 <= 10 returns 1). The value of x is increased by a factor of 2, which is 2 and the program prints out this value to the command window. #ELSE IF MATLAB CODE#
Then when it passes to the while loop the conditional statement is true ( x <= 10 has a logical value of 1), and the program executes the code within the loop body. The last command is to display the result on the command window. The switch will select from the three cases and convert Tin to the new unit and assign the value to Tout. Second, we check the new desired unit which is stored in Unit2. Then we convert T1 to unit of Celcius and assign the value to Tin. The initial unit and the temperature value are kept in Unit1 and T1 respectively. If the value is a string, we put 's' as an option to the input command. Unit1 = input ( 'Enter the current units (K,C,F): ', 's' ) T1 = input ( 'Enter the value of the temperature to be converted: ' ) Unit2 = input ( 'Enter the new unit (K,C,F): ', 's' ) switch Unit1 case 'C' Tin = T1 case 'F' Tin = ( T1 -32 ) * (5 /9 ) case 'K' Tin = T1 -273 end switch Unit2 case 'C' Tout = Tin case 'F' Tout = (5 /9 ) * Tin +32 case 'K' Tout = Tin + 273 end disp () įirst we have used the command input to accept a value from the keyboard. MATLAB can tell the difference the two usages of end from the context.Īs an example, consider the solution of a quadratic equation of the form
Note that the keyword end in this contruct is completely different from the MATLAB function end we use for indexing arrays (to return the last entry of a vector). If all conditional statements are false, and there is no else clause, then the program skips to the end without executing any part of the if construct. There can be any number of elseif clauses (0 or more) in an if construct, but there can be at most one else clause. If all conditional statements return zero (false), then the program executes the expressions in the block associated with the else clause. If it is true, then the program executes the expressions in the second block and skips to the end. Otherwise, the program checks for the result of CONDITIONAL_STATEMENT2. If CONDITIONAL_STATEMENT1 is true (returns 1 when it is non-zero), then the program executes the expressions in the first block and skips to the end. The conditional statements are logical expressions that control the operation of if construct. elseif CONDITIONAL_STATEMENT2 expression 1
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