Engineering Fundamentals: An Introduction to Engineering, 4th ed.c

>>a+b

ans = 8 7 8 6

>>a-b

ans = 6 1 -2 -8

>>3*a

ans = 21 12 9 -3

>>3.*a

ans = 21 12 9 -3

>>a.*b

ans = 7 12 15 -7

>>b.*a

ans = 7 12 15 -7

>>3.^a

ans = 1.0e+003*

2.1870 0.0810 0.0270 0.0003

>>a.^b

ans = 7 64 243 -1

>>b.^a

ans = 1.0000 81.0000 125.0000 0.1429

Try also the following example on your own.

Example 14.1 This example will show how the density of standard air changes with temperature. It also makes

(Revisited) use of MATLAB’s element by element operation. The density of standard air is a function of

temperature and may be approximated using the ideal gas law according to

where

Pstandard atmospheric pressure (101.3 kPa)

Rgas constant and its value for air is 286.9

Tair temperature in Kelvin (K)

a

J

kg#K

b

r

P

RT

TABLE 15.4 MATLAB’s Element by Element Operations

Equivalent Element by

Arithmatic Element Symbol for

Operation Operations the Operation

Addition 

Subtraction 

Multiplication * .*

Division /. /

Raised to a power ^ .^

468 Chapter 15 MATLAB

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