What Math.Tanh(1) return?

  • Thread starter Thread starter Polaris
  • Start date Start date
P

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
 
Polaris said:
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?
Click to expand...

Math.Tanh does some different.

It is Math.Atan you want !

Arne
 
Math.Tanh does some different.

It is Math.Atan you want !

Arne
Click to expand...

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
 
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...
Click to expand...

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
 
Hans Kesting said:
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.
Click to expand...

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?)
 
Ben Voigt said:
Everyone believes that PI is irrational, which means that the repetition
does not, in fact, occur, no matter the base.
Click to expand...

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".
 
Chris said:
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".
Click to expand...

Can base be non-integer ?

Arne
 
Chris said:
Sure.

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

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
 
Back
Top