log(value,base) versus logb(value,base)

04112015, 12:32 PM
Post: #1




log(value,base) versus logb(value,base)
exac mode and simplify maximun
logb(e,i) => 2*i/π ok // base i, value e log10(e)/log10(i)==logb(e,i) => 1 = true ok but the exact mode shows approximate =( log10(e)/log10(i) => −0.636619772368*i log(e,i) => [ (i*π/2), 1] ? 

04112015, 03:31 PM
Post: #2




RE: log(value,base) versus logb(value,base)
Same reason sin(1,2,3,4) is a perfectly valid input in the CAS. Any number of arguments are accepted and calculated as [sin(1),sin(2)...]
TW Although I work for HP, the views and opinions I post here are my own. 

04112015, 10:33 PM
Post: #3




RE: log(value,base) versus logb(value,base)
the help of log says:
LOG(Value, [base]) log(8,2) => 3 log(e,i) => base=I, value=e => [ (i*π/2), 1] ? 

04112015, 11:39 PM
Post: #4




RE: log(value,base) versus logb(value,base)
In the CAS environment, objects separated by commas are elements of a list. Thus command(a,b,c,d) is actually interpreted as command([a,b,c,d]) where [] is a list (in the CAS environment). Secondly, LOG() and log() are different commands. You are probably trying to evaluate LOG(e,i), which is \( \log_i(e) \). However, if you type log(e,i) in the CAS environment then this is equivalent to LN({e,i}) in the Home environment since the CAS implements ln(x) as log(x)  most CAS do this as well.
That said, when I type in log(e,i) in the CAS view, I get \( [1 \quad \frac{i}{2}*\pi ] \) and not the reverseordered list that you typed. Graph 3D  QPI  SolveSys 

04132015, 02:35 PM
(This post was last modified: 04132015 03:47 PM by compsystems.)
Post: #5




RE: log(value,base) versus logb(value,base)
Thanks Han
Without a real help, it is difficult to manipulate the hpPrime the true help LOG command should be as follows, are agree or not? General Logarithm
LOG(Value,[Base])General logarithmic function Return the logarithm of value in Base, By default, Base=10 Example LOG(100,10) ▶ 2 LOG(100) ▶ 2 LOG(10,2.) ▶ 3.32192809489 LOG(10,e^1.) ▶ 2.30258509299 log(Value1,[Value2],[Value n]) Return the natural logarithm of value(s) Example log(100,10) ▶ [ln(100),ln(10)] ok ln(100.,10.) ▶ [ 4.60517018599,2.30258509299 ] I agree that the command can be written in lowercase or uppercase, to duplicate the function of the same =), is not valid is that no finds a documentation or help of each case 

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