What Math.Tanh(1) return?

[Polaris]

Hi Experts:

I have a question about Math.Tanh:

For a 45 degree 'angle' (radians is 45 * pi / 180 = 0.785), Math.Tan(angle)
returns 1 as expected; but Math.Tang(1) returns 0.76. Why not 0.785?

Thanks in Advance!
Polaris

 

[Arne Vajhøj]

I have a question about Math.Tanh:

For a 45 degree 'angle' (radians is 45 * pi / 180 = 0.785),
Math.Tan(angle) returns 1 as expected; but Math.Tang(1) returns 0.76.
Why not 0.785?

Math.Tanh does some different.

It is Math.Atan you want !

Arne

 

[Polaris]

Thanks!
Polaris

Math.Tanh does some different.

It is Math.Atan you want !

Arne

 

[christery]

Math.Tanh does some different.

It is Math.Atan you want !

Arne

So to start a fire...

so u expect math.Atan(1)*4 to return the complete PI,
3.141592653589.... and so on for all eternity... tell the computer how
it should be stored and presented...

heard there should be a circle somwhere if u print it (PI) with a 80
char/row printer for a couple of years... newer got around to that
though...

//CY

 

[Hans Kesting]

heard there should be a circle somwhere if u print it (PI) with a 80

char/row printer for a couple of years... newer got around to that
though...

That's from the novel "Contact" by Carl Sagan and (if I remember
correctly) you should use base 11.
I doubt if it is true but given an infinite amount of "random" numbers,
anything could happen.

Hans Kesting

 

[Ben Voigt [C++ MVP]]

That's from the novel "Contact" by Carl Sagan and (if I remember
correctly) you should use base 11.
I doubt if it is true but given an infinite amount of "random" numbers,
anything could happen.

But the likelihood of the subsequent infinity of digits being an exact
repetition would be infinitesimal.

Everyone believes that PI is irrational, which means that the repetition
does not, in fact, occur, no matter the base. BTW any repeating decimal can
be written as a terminating decimal in some other base (is a decimal in a
base other than 10 still called a decimal?)

 

[Chris Mullins [MVP - C#]]

Everyone believes that PI is irrational, which means that the repetition
does not, in fact, occur, no matter the base.

My math may be a bit rusty, but I don't think that's not exactly true.

In base Pi, the number is completly rational - "1".

 

[Arne Vajhøj]

Everyone believes that PI is irrational,

It has been proven to be both irrational and transcendent.

Arne

 

[Arne Vajhøj]

My math may be a bit rusty, but I don't think that's not exactly true.

In base Pi, the number is completly rational - "1".

Can base be non-integer ?

Arne

 

[Chris Mullins [MVP - C#]]

Can base be non-integer ?

Sure.

Everyone's familiar with base "e" - it's broadly accepted and supported.

For a funny, and very on-topic bit of humor...
http://xkcd.com/217/

 

[Arne Vajhøj]

Sure.

Everyone's familiar with base "e" - it's broadly accepted and supported.

Everyone is familiar with the exponential function.

I have never seen e used as base in a positional number system.

Nor pi.

(BTW, Pi would be 10 not 1 in a Pi based system ????)

Arne