Control Flow and Logic Functions in Matlab
Most
of the computer programming provides a flow control feature, as well as MATLAB.
One example of Control flow in MATLAB is:
 Looping for
 Looping while
 Ifelse statement
LOOPING FOR
The
basic syntax for looping for is
for i = array
block statment
end
every
time you pass this loop, the value of the looping variable i is the next value
in the array. Colon notation is usually used to generate a sequence of numbers.
Example:
for i = 1: 10
commands
between for and end are executed once in each array. Some looping may be
nested, where each loop ends with end.
LOOPING WHILE
Looping while will execute
an uncertain number of times. in general the syntax of the loop is
while expression
block
statement
end
commands between while and
end will be executed as long as the expression is correct. Note that in MATLAB
a nonzero scalar is declared true. Usually a scalar is used in expressions,
but an array can also be used. If the expression is an array, then all the
elements in the array must be correct to execute the commands.
IFELSE STATEMENT
sometimes, commands must be
executed based on certain conditions. An ifelse statement is suitable for that
case. In general the syntax of the statement is
if expression
block
statement
elseif expression
block
statement
else
block
statement
end
only one end is needed to
end the if, elseif, and else statements. Commands will be executed if the
expression is correct.
RELATION AND LOGIC OPERATORS IN MATLAB
In practice
while looping and ifelse statements often use relations operators and logical
operators. The relation operator is used to test whether two values are the
same, or one value is greater, or smaller than the other value. Whereas Logic
Operators are used to combine logic statements to produce other logical values.
Operator

Definition

Type

<

less than

Relation

<=

less than or
equal to

Relation

>

more than

Relation

>=

More than or
equal to

Relation

==

Together with

Relation

~=

Not equal to

Relation

&

And

Logic



Or

Logic

~

Not or not

Logic

By
applying a relation operator, the result is a logical value (true / false / 1)
or (false / false / 0).
The
following is a simple example of using a relation operator,
While
the example of using a logical operator is
SOME EXAMPLES OF MATLAB FLOW AND LOGIC CONTROL
In
this section several examples of simple programs in the form of mfiles will be
given to illustrate the use of theories discussed earlier.
Use Looping For (save with filename
example4.m)
function sum=example4(x)
n=length(x);
sum=0;
for k=1:n
sum=sum+x(k);
end
Use of Looping While (save with file name
example5.m)
function example5(x)
n=length(x);
m=median(x);
xsort=sort(x);
i=1;
while xsort(i)<=m
i=i+1;
end
disp ('Number of
data <= median exists'); disp (i1);
disp ('Amount of
data> median exists'); disp (ni + 1);
end
Use the IFELSE Statement (save with the
file name example6.m)
function example6(x)
if x>0
disp ('x value is positive');
elseif x <0
disp ('x value is negative');
else
disp ('x value is 0');
end
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