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Question: Why can't isolate not isolate theta(q) but solve can

Question:Why can't isolate not isolate theta(q) but solve can

C_R 2557 Maple
isolate
May 16 2023
0

[6600.0*theta(q)-17000.0*theta(q-1)+14400.0*theta(q-2)-4000.0*theta(q-3) = v(q)-.20*theta(q)+.20*theta(q-1)]

[6600.0*theta(q)-17000.0*theta(q-1)+14400.0*theta(q-2)-4000.0*theta(q-3) = v(q)-.20*theta(q)+.20*theta(q-1)]

 (1)

isolate([6600.0*theta(q)-17000.0*theta(q-1)+14400.0*theta(q-2)-4000.0*theta(q-3) = v(q)-.20*theta(q)+.20*theta(q-1)], theta(q))

Error, (in isolate) invalid arguments for isolate

  

solve([6600.0*theta(q)-17000.0*theta(q-1)+14400.0*theta(q-2)-4000.0*theta(q-3) = v(q)-.20*theta(q)+.20*theta(q-1)], theta(q))[]

theta(q) = 0.1515105603e-3*v(q)+2.575709827*theta(q-1)-2.181752068*theta(q-2)+.6060422411*theta(q-3)

 (2)

It works for h(x)  in help(isolate)


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