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Anonymous and Inline Functions in MATLAB

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MATLAB's anonymous functions provide an easy way to specify a function. An anonymous function is a function defined without using a separate function file. It is a MATLAB feature that lets you define a mathematical expression of one or more inputs and either assign that expression to a function. This method is good for relatively simple functions that will not be used that often and that can be written in a single expression.

The inline command lets you create a function of any number of variables by giving a string containing the function followed by a series of strings denoting the order of the input variables. It is similar to an Anonymous Function

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Anonymous and Inline Functions in MATLAB

  1. 1. Anonymous and Inline Functions Shameer A Koyahttp://electricalenggtutorial.blogspot.com 1
  2. 2. • MATLAB's anonymous functions provide an easy way to specify a function. • An anonymous function is a function defined without using a separate function file • It is a MATLAB feature that lets you define a mathematical expression of one or more inputs and either assign that expression to a function. • This method is good for relatively simple functions that will not be used that often and that can be written in a single expression. http://electricalenggtutorial.blogspot.com 2
  3. 3. • An anonymous function of any number of variables can be created by giving the @ symbol, followed by a variable list, followed by the MATLAB expression. • Anonymous function can be written in Command Window, script file, or inside user-defined function. • It is similar to an Inline Function with some significant differences. • Anonymous functions can only have one expression and can only return a single variable http://electricalenggtutorial.blogspot.com 3
  4. 4. • To give the anonymous function a name, simply put the function's name on the left side of an equal sign and the anonymous function on the right. • NAME = @(ARGLIST)EXPRESSION • NAME is name of the function. (using rules for names of user- defined functions) • @ - a function handle, an object that has information about the function • ARGLIST is the input arguments (a comma-separated list). • The body of the function, to the right of the parentheses, is a single line MATLAB expression. • Execute the function by calling it by means of the given name same way as user-defined functions. http://electricalenggtutorial.blogspot.com 4
  5. 5. >> z = @(x, y) x.^3-y.^3 z = @(x, y) x.^3-y.^3 >> z( 3, 2) ans = 19 >> triarea = @(a, h) 1/2*a*h triarea = @(a, h) 1/2*a*h >> triarea(2,2) ans = 2 >> x = 5; >> y = 4; >> area = triarea(x, y) area = 10 http://electricalenggtutorial.blogspot.com 5
  6. 6. • An anonymous function expression can use a variable that have been defined before the function is defined. • Value of the variable when the function is defined will be used for evaluating the expression. • The changes made after the expression is defined will not be reflected in evaluating the function. • >> f = 5o; • >> sinewave = @(t) sin( 2*pi*f.*t ); • >> x=[0:0.001:0.2]; • >> y=sinewave(x); • >> plot(x,y) http://electricalenggtutorial.blogspot.com 6
  7. 7. • Anonymous function will be unaffected by any variable change after the function is defined >> a = 2; >> b = 3; >> sample = @(x,y) a*x.^2 + b*y^2; >> c = sample( 2, 1 ) c = 11 >> a = 5 a = 5 >> b = 0 b = 0 >> c = sample( 2, 1 ) c = 11 http://electricalenggtutorial.blogspot.com 7
  8. 8. • The inline command lets you create a function of any number of variables by giving a string containing the function followed by a series of strings denoting the order of the input variables. • This method is good for relatively simple functions that will not be used that often and that can be written in a single expression. • It is similar to an Anonymous Function http://electricalenggtutorial.blogspot.com 8
  9. 9. • Name = inline(‘expression‘)creates an inline function object from the expression. • The input arguments are automatically determined by searching the expression for variable names. • If no variable exists, 'x' is used. • The expression to be evaluated is defined in single quotes, followed in order by the variables of the function also surrounded by single quotes. • Name = inline(‘expression', 'arg1', ‘arg2') http://electricalenggtutorial.blogspot.com 9
  10. 10. >> z = inline('x.^3-y.^3', ‘x', ‘y') z = Inline function: z(x,y) = 'x.^3-y.^3 >> z( 3, 2) ans = 19 >> sinewave=inline('sin(2*pi*f.*t)') sinewave = Inline function: sinewave(f,t) = sin(2*pi*f.*t) >> sinewave=inline('sin(2*pi*f.*t)','f','t'); http://electricalenggtutorial.blogspot.com 10

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