Gradient descent: Difference between revisions
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(→{{header|REXX}}: changed comments and whitespace, simplified some statements, optimized the GRADG function,) |
m (→{{header|REXX}}: moved a function to the one-line function section.) |
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tolerance= 0.0000006 |
tolerance= 0.0000006 |
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alpha= 0.1 |
alpha= 0.1 |
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x.0= 0.1; x.1= -1 |
x.0= 0.1; x.1= -1 |
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say center(' testing for the steepest descent method ', 79, "═") |
say center(' testing for the steepest descent method ', 79, "═") |
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call steepestD /* ┌──◄── # digs past dec. point ─►───┐*/ |
call steepestD /* ┌──◄── # digs past dec. point ─►───┐*/ |
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exit /*stick a fork in it, we're all done. */ |
exit /*stick a fork in it, we're all done. */ |
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/*──────────────────────────────────────────────────────────────────────────────────────*/ |
/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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| ⚫ | |||
g: return (x.0-1)**2 * exp(- (x.1**2) ) + x.1 * (x.1 + 2) * exp(-2 * x.0**2) |
g: return (x.0-1)**2 * exp(- (x.1**2) ) + x.1 * (x.1 + 2) * exp(-2 * x.0**2) |
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/*──────────────────────────────────────────────────────────────────────────────────────*/ |
/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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end /*while*/ |
end /*while*/ |
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return |
return |
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/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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| ⚫ | |||
/*──────────────────────────────────────────────────────────────────────────────────────*/ |
/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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exp: procedure; parse arg x; ix= x%1; if abs(x-ix)>.5 then ix= ix + sign(x); x= x - ix |
exp: procedure; parse arg x; ix= x%1; if abs(x-ix)>.5 then ix= ix + sign(x); x= x - ix |
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