Error when solving an equation involving a poisson pdf

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Hello, I am trying to find for what values of lambda P(X=10) = 0.1, if X~Po(lambda)
My code is:
syms lambda
solve(poisspdf(10,lambda)==0.1, lambda)
the error I get is:
'error using symengine. Unable to prove 'lambda<0' literally . Use 'isAlways to test the statement mathematically
any help would be much appreciated!

Risposta accettata

Star Strider
Star Strider il 17 Nov 2019
Try this (instead of using the Symbolic Math Toolbox):
lambda = fzero(@(lambda) poisspdf(10, lambda) - 0.1, 5)
producing:
lambda =
8.0299
  3 Commenti
Louis Sharma
Louis Sharma il 18 Nov 2019
actually I was able to ge the second solution by changing the range. Thanks
Star Strider
Star Strider il 18 Nov 2019
As always, my pleasure!
(I was sleeping, not ignoring you!)

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