22 lines
431 B
Matlab
22 lines
431 B
Matlab
clear,clc
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pkg load symbolic
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f = inline('exp(x)')
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h = 0.1;
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x = [1.4 1.5 1.6]
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y = f(x)
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first_diff_forward_y = (y(3) - y(2)) / h
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first_diff_backward_y = (y(2) - y(1)) / h
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first_diff_central_y = (y(3) - y(1)) / (2*h)
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syms x;
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Y = exp(x);
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Y1 = diff(Y)
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Y2 = diff(Y,2)
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YY1 = inline(Y1)
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y1e = YY1(1.5)
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YY2 = inline(Y2)
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y2e = YY2(1.5)
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M = [ first_diff_backward_y first_diff_central_y first_diff_forward_y]
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RPE = (abs(y1e - M) / y1e) * 100
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