Billy T

04-02-2003, 01:16 PM

Hi Team

I need a hand with a mathematical problem. I'm OK on most routine stuff but my maths education finished in in the 60's and this has me stumped.

I have a series of formulae for calculating particular electrical characteristics at varying frequencies including some worked examples (minus the actual working unfortunately). The actual characteristics are unimportant, it is the means of obtaining the result that I can't fathom.

The formulae include a decimal fraction i.e. 0.247 or 0.5 in superscript after the number in the same way that we might write a power. Problem is, I haven't the faintest idea how the superscript number is applied and even my fairly switched on daughter (who just passed fifth form NCEA maths while still a 4th former) can't help. All she can do is laugh at my struggles with all the sensitivity that we have come to expect from children when they finally realise that not only do their parents not know everything, sometimes they know nothing at all! :(

Here are a few examples with the final result included.

3454f (0.753) = 1733 [where f= 0.4, and (0.753) follows f in superscript and without the curved brackets]

9.06/f (0.247) = 11.4 [where f = 0.4, with 0.247 as in the example above]

The value f is the frequency in MHz and the examples given above are for a frequency of 400 kHz.

A couple of example for a superscript factor of 0.5 are:

44f (0.5) = 2147 where f = 500MHz

0.118f (0.5) = 5.7 (f is again 500MHz)

I want to solve the following examples for f = 350 kHz

3454f (0.753) =?

493f (0.753) =?

9.06/f (0.247) =?

4.13/f (0.247) =?

Obviously the decimal fraction is a power or factor of some sort but I'm not even sure that description is correct. I'm picking that a scientific calculator is required for this and I have one right in front of me now, but the problem is I can't drive the thing apart from a few very basic functions.

Any help will be gratefully accepted.

Cheers

Billy 8-{) Imagine emoticon for face full of hope here:.........

Oh how I wish I'd paid more attention in maths all those years ago :( :(

I need a hand with a mathematical problem. I'm OK on most routine stuff but my maths education finished in in the 60's and this has me stumped.

I have a series of formulae for calculating particular electrical characteristics at varying frequencies including some worked examples (minus the actual working unfortunately). The actual characteristics are unimportant, it is the means of obtaining the result that I can't fathom.

The formulae include a decimal fraction i.e. 0.247 or 0.5 in superscript after the number in the same way that we might write a power. Problem is, I haven't the faintest idea how the superscript number is applied and even my fairly switched on daughter (who just passed fifth form NCEA maths while still a 4th former) can't help. All she can do is laugh at my struggles with all the sensitivity that we have come to expect from children when they finally realise that not only do their parents not know everything, sometimes they know nothing at all! :(

Here are a few examples with the final result included.

3454f (0.753) = 1733 [where f= 0.4, and (0.753) follows f in superscript and without the curved brackets]

9.06/f (0.247) = 11.4 [where f = 0.4, with 0.247 as in the example above]

The value f is the frequency in MHz and the examples given above are for a frequency of 400 kHz.

A couple of example for a superscript factor of 0.5 are:

44f (0.5) = 2147 where f = 500MHz

0.118f (0.5) = 5.7 (f is again 500MHz)

I want to solve the following examples for f = 350 kHz

3454f (0.753) =?

493f (0.753) =?

9.06/f (0.247) =?

4.13/f (0.247) =?

Obviously the decimal fraction is a power or factor of some sort but I'm not even sure that description is correct. I'm picking that a scientific calculator is required for this and I have one right in front of me now, but the problem is I can't drive the thing apart from a few very basic functions.

Any help will be gratefully accepted.

Cheers

Billy 8-{) Imagine emoticon for face full of hope here:.........

Oh how I wish I'd paid more attention in maths all those years ago :( :(