topic Re: How to use Logarithmic Expression in Mathcad

How to use Logarithmic Expression

KS_10864537 — Wed, 22 May 2024 09:12:25 GMT

I want to use the a=log10V

Re: How to use Logarithmic Expression

Cornel — Wed, 22 May 2024 10:05:57 GMT

Re: How to use Logarithmic Expression

ttokoro — Wed, 22 May 2024 10:44:24 GMT

Re: How to use Logarithmic Expression

Werner_E — Wed, 22 May 2024 11:29:13 GMT

@KS_10864537 wrote:

I want to use the a=log10V

And why don't you do so? Whats the problem you experience?

There is nothing wrong in using the help facility -> Exponential and Logarithmic Functions

You may see that Prime does not support the usual math notation using the base of the logarithm as an index, but rather provides a function with two arguments with the base as the second argument.
If you omit the second argument, base 10 is assumed by default. That's bad habit as "log" should only be used as a name for generic logarithm, e.g. when you write up a general rule like log(a*b)=log(a)+log(b). Otherwise according to the standards you should use "ln" for the natural logarithm (as is the case in Prime), "lg" for the decadal logarithm and "logb" for the logarithm with base b (in Prime log(..., b) )
Even worse there is other software which uses "log" for the natural logarithm to make the confusion perfect 😞

If you want to stick to the standards in Prime you can achieve this by defining a function "lg" yourself (you may hide that definition in a collapsed area or at the right margin at the top of the sheet).

By the way - here in the forum it is expected that questioners close a thread that they have opened after they got answers. Feel free to comment on the answers given and ask further question if something still is unclear. -> How to remove collapsible area line while generati...

Re: How to use Logarithmic Expression

ttokoro — Thu, 23 May 2024 22:55:27 GMT

(@ID log (@SUB ₁₀) V) Copy this text to math resion. You can get variable log10V and it can define as follows.

Re: How to use Logarithmic Expression

vnamboodheri — Wed, 29 May 2024 08:04:08 GMT

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