matlab ch4

7/18/2019 Matlab Ch4

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Mechanical Engineering Department

MATLAB PROGRAMMING FOR ENGINEERS

Matlab Programming for EngineersMatlab Pr

ogramming for Engineers

Dr. Nidal Farhat

Introduction to MatlabIntroduction to Matlab

Matlab BasicsMatlab Basics

BranchingBranchingStatementsStatementsLoopsLoops

User Defined FunctionsUser Defined Functions

Additional Data TpesAdditional Data Tpes

Input!"utput FunctionsInput!"utput Functions

Simulin# Toolbo$Simulin# Toolbo$

Important Toolbo$es %if time is a&ailable'Important Toolbo$es %if time is a&ailable'


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OBJECTIVES

The whileLoop

The forLoop

Logical Arra! a"# $ec%ori&a%io"

The Ma%la' Profiler


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THE whileLOOP

S%r(c%(re:The Code Block is repeateduntil the expression is false.

If it is false, the program

executes the first statement

after the end.


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THE whileLOOP

E)a*ple:

+ri%e a progra* %ha% calc(la%e! %he a,erage-

a"# %he !%a"#ar# #e,ia%io"-

for a !e% of ,al(e! ./0- e"%ere# ' %he (!er1


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THE whileLOOP

Sol(%io":


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THE whileLOOP

Sol(%io" .*o#ifie#0:


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THE whileLOOP

Sol(%io" .*o#ifie#0:


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THE forLOOP

S%r(c%(re:

Repea%! a 'loc2 of !%a%e*e"%! .Bo#0 !pecifie# "(*'er of %i*e!1

Legal E)a*ple!:

Matlab generates an array by

evaluating this expression

column by column.


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THE forLOOP

Legal E)a*ple!:


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THE forLOOP

E)a*ple .The Fac%orial F("c%io"0:

N3 N 5 .N670 5 .N680 5 9 5 5 8 5 7


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THE forLOOP

E)a*ple .The Fac%orial F("c%io"0:

N3 N 5 .N670 5 .N680 5 9 5 5 8 5 7


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THE forLOOP

E)a*ple- calc(la%i"g %he #a of ear:


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THE forLOOP

E)a*ple:

;!e THE for LOOP %o calc(la%e %he a,erage a"# !%a"#ar# #e,ia%io" for

a" ."0 ,al(e! .*o#if %he pre,io(! while progra*01


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THE forLOOP


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THE forLOOP


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THE forLOOP

The 'rea2 a"# co"%i"(e S%a%e*e"%!:

The 'rea2!%a%e*e"% %er*i"a%e! %he e)ec(%io" of a loop a"# pa!!e!

co"%rol %o %he "e)% !%a%e*e"% af%er %he e"# of %he loop- e)a*ple:


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THE forLOOP

The 'rea2 a"# co"%i"(e S%a%e*e"%!:

The co"%i"(e!%a%e*e"% %er*i"a%e! %he c(rre"% !%ep of %he loop a"#

re%(r" %he co"%rol %o %he %op of %he loop- e)a*ple:

co"%i"(e


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THE forLOOP

Ne!%i"g Loop!:

O(%p(%

ii jj product


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THE forLOOP

Ne!%i"g Loop!:

O(%p(%

ii jj product


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THE forLOOP

Ne!%i"g Loop!:

The 'rea2Dco"%i"(e !%a%e*e"%! %he appl %o %he c(rre"% loop- e)a*ple:


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THE forLOOP

Logical arra a"# ,ec%ori&a%io":


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THE forLOOP


Logical arra! ca" !er,e a! a maskfor ari%h*e%ic opera%io"!1 The

!pecifie# opera%io" will be applied to the selected elementsa"# "o% %o

%he re*ai"i"g ele*e"%!- e)a*ple:

+ill %a2e %he !(are roo% of all ele*e"%!

for which %he logical arra ' i! %r(e a"#

lea,e all %he o%her ele*e"%! i" %he arra

("cha"ge#



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THE forLOOP


E)a*ple 7:

Calc(la%e %he !r% of all %he ele*e"%! of arra .a0 1

Fa!%er

:MATLAB PROGRAMMING FOR ENGINEERS


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THE forLOOP


E)a*ple 8: Calc(la%e %he !r% of all %he ele*e"%! of arra .a0 - a"# %he

!(are of %he re*ai"i"g .("!elec%e# ' %he pre,io(! opera%io"01



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THE forLOOP

The Ma%la' Profiler:

;!e# %o i#e"%if %he par%! of %he progra* %ha% co"!(*e *o!% e)ec(%io"

%i*e1



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THE forLOOP

The Ma%la' Profiler:



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THE forLOOP

E)a*ple:.Proec%ile Mo%io"0

Ge"eral e(a%io":

+he" %he 'all hi%! %he gro("#0

2*

0,y

v

t tg

= =

0

0

210 2

0

( )

( )

y

x

y t y v t gt

x t x v t

= +

= +

0

0

0

0

sin( )

cos( )

y

x

v v

v v

=

=



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THE forLOOP

E)a*ple:.Proec%ile Mo%io"0

Ge"eral e(a%io":

+he" %he 'all hi%! %he gro("#0

2*

0,y

v

t t g= =

0

0

210 2

0

( )

( )

y

x

y t y v t gt

x t x v t

= +

= +

0

0

0

0

sin( )

cos( )

y

x

v v

v v

=

=



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THE forLOOP

E)a*ple:.Co**a"#! a"# F("c%io"!0



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Home Work

Sol,e %he followi"g pro'le*!:

417- 7J- 87

matlab ch4

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