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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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388 Approximate Calculations [Ch. 10<br />

Table 1. Calculat<strong>in</strong>g^,, jr2 , y9 by the Runge-Kutta Method.<br />

f(x, y) =<br />

Calculat<strong>in</strong>g the value of jf4 . We<br />

have: f(x, y) =<br />

j/ =1. 5000, r/, = 1.8920, yt = 2.3243,<br />

^=1.5000, ^' = 1.6420, ^=1.8243,<br />

Apply<strong>in</strong>g formulas (5), we f<strong>in</strong>d<br />

= 02 + ^(01<br />

y, /z = 0.25,<br />

,== 2.8084;<br />

= 2.0584.<br />

4 A OK<br />

= 1.5000 +-^ (2- 1.6420-1.8243 + 2. 2.0584) = 3.3588;<br />

1+3.3588 = 2.3588;<br />

h y' = t ) 2.3243 +^ (2.3588 + 4- 2.0584 + 1 .8243) = 3.3590;<br />

' . 3.3588-3.3590 1<br />

hence, there is no need to reconsider the <strong>in</strong>terval of calculations.

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