Can't explain:
1. γ(a,x) does Not plot on canvas [whatever 'a']
2. Γ(a,x) integrator => strictly upper limit 100
3. "t not defined" ... Smath does not interpret ?
4. Does not solve either !

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Could it be the Smath Simpson Integrator is the guilty One ?

Jean

Maths Gamma(x) Incomplete.sm (46.42 KiB) downloaded 471 time(s).

... forgot this:

For the discrete quick plots [γax,Γax]: options/Integral accuracy 100.
Then, disable the two discrete modules & quick plot.
For accurate work sheet calculations: Options/Integral accuracy 10000

Cheers .. Jean

Wrote

Designers: can you upgrade/repair to "Casio"

Could it be the Smath Simpson Integrator is the guilty One ?

The problem seems in t^{a-1}; if a is less than 1, this term is 1/nthroot(t,...), therefore is infinite in 0 -> you can fix it using 10^-15 as lower bound of the integration (in such cases).