This is driving me mad...

Can anyone tell me how to do the following equation on a calculator?

1 / [1 + e-(1*0.5+1*0.4-1*0.8)]

Cheers,

TK

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- May 10th 2008, 04:56 AMtomjkearTI Program
This is driving me mad...

Can anyone tell me how to do the following equation on a calculator?

1 / [1 + e-(1*0.5+1*0.4-1*0.8)]

Cheers,

TK - May 10th 2008, 05:00 AMMoo
- May 10th 2008, 05:03 AMtomjkear
- May 10th 2008, 05:13 AMMoo
Oh, I see

e has a value approaching 2.7. Actually it's e^(...).

It's the exponential function : Exponential function - Wikipedia, the free encyclopedia

So if you want to enter the function in your calculator, it should be :

1/(1+e^(-(1*0.5+1*0.4-1*0.8))) - May 10th 2008, 05:17 AMtomjkear
Thanks.

I know the result should be 0.5250 according to the textbook I am using. But doing the above in my calculator returns 0.5 for some reason.

Another similar example that is given is:

1/(1+e^(-(1*0.9+1*1.0+1*0.1)))

This should return 0.8808 but also returns 0.5 on my calculator.

If it helps the calculator is a Sharp EL-530L. - May 10th 2008, 05:26 AMMoo
- May 10th 2008, 05:40 AMtomjkear