# lab - Numbers Matlab recognizes several different kinds of...

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Unformatted text preview: Numbers Matlab recognizes several different kinds of numbers Type Examples Integer 1362;-217897 Real 1:234;-10:76 Complex 3:21 - 4:3i (i = -1) Inf Infinity (result of dividing by 0) NaN Not a Number, 0=0 Formats Command Example of Output format short 31.4162(4{decimal places) format short e 3.1416e+01 format long e 3.141592653589793e+01 format short 31.4162(4{decimal places) format bank 31.42(2{decimal places) Examples >> format long >> x = 3 + 11/16 + 2^1.2 x = 5.98489670999407 >> format short >> x = 3 + 11/16 + 2^1.2 x = 5.9849 Variables >> 3-2^4 ans =-13 >> ans*5 ans =-65 The result of the first calculation is labelled \ans" by Matlab and is used in the second calculation where its value is changed.We can use our own names to store numbers: >> x = 3-2^4 x =-13 >> y = x*5 y =-65 so that x has the value x= -13 and y = - 65. These can be used in subsequent calculations. These are examples of assignment statements: values are assigned to variables. Each variable must be assigned a value before it may be used on the right of an assignment statement. Variable Names Legal names consist of any combination of letters and digits, starting with a letter. These are allowable: NetCost, Left2Pay, x3, X3, z25c5 These are not allowable: Net-Cost, 2pay, %x, @sign Suppressing output One often does not want to see the result of intermediate calculations terminate the assignment statement or expression with semi{colon >> x=-13; y = 5*x, z = x^2+y y =-65 z = 104 >> the value of x is hidden. Note also we can place several statements on one line, separated by commas or semi{ colons. Exercise 1 In each case the value of the expression in Matlab and explain precisely the order in which the calculation was performed....
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lab - Numbers Matlab recognizes several different kinds of...

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