lambda with floats
in [Python]
|
From: Bas on 9 Apr 2010 03:43 On Apr 7, 6:15 am, Patrick Maupin <pmau...(a)gmail.com> wrote: > I should stop making a habit of responding to myself, BUT. This isn't > quite an acre in square feet. I just saw the 43xxx and assumed it > was, and then realized it couldn't be, because it wasn't divisible by > 10. (I used to measure land with my grandfather with a 66 foot long > chain, and learned at an early age that an acre was 1 chain by 10 > chains, or 66 * 66 * 10 = 43560 sqft.) > That's an exact number, and 208 is a poor approximation of its square > root. There is no need to remember those numbers for the imperially challenged people: In [1]: import scipy.constants as c In [2]: def acre2sqft(a): ...: return a * c.acre / (c.foot * c.foot) ...: In [3]: acre2sqft(1) Out[3]: 43560.0 Cheers, Bas
From: monkeys paw on 9 Apr 2010 14:22 On 4/9/2010 3:43 AM, Bas wrote: > On Apr 7, 6:15 am, Patrick Maupin<pmau...(a)gmail.com> wrote: >> I should stop making a habit of responding to myself, BUT. This isn't >> quite an acre in square feet. I just saw the 43xxx and assumed it >> was, and then realized it couldn't be, because it wasn't divisible by >> 10. (I used to measure land with my grandfather with a 66 foot long >> chain, and learned at an early age that an acre was 1 chain by 10 >> chains, or 66 * 66 * 10 = 43560 sqft.) >> That's an exact number, and 208 is a poor approximation of its square >> root. > > There is no need to remember those numbers for the imperially > challenged people: > > In [1]: import scipy.constants as c scipy.constants ?? doesn't work for me. > > In [2]: def acre2sqft(a): > ...: return a * c.acre / (c.foot * c.foot) > ...: > > In [3]: acre2sqft(1) > Out[3]: 43560.0 > > > Cheers, > Bas
From: Patrick Maupin on 9 Apr 2010 14:40 On Apr 9, 1:22 pm, monkeys paw <mon...(a)joemoney.net> wrote: > On 4/9/2010 3:43 AM, Bas wrote: > > > On Apr 7, 6:15 am, Patrick Maupin<pmau...(a)gmail.com> wrote: > >> I should stop making a habit of responding to myself, BUT. This isn't > >> quite an acre in square feet. I just saw the 43xxx and assumed it > >> was, and then realized it couldn't be, because it wasn't divisible by > >> 10. (I used to measure land with my grandfather with a 66 foot long > >> chain, and learned at an early age that an acre was 1 chain by 10 > >> chains, or 66 * 66 * 10 = 43560 sqft.) > >> That's an exact number, and 208 is a poor approximation of its square > >> root. > > > There is no need to remember those numbers for the imperially > > challenged people: > > > In [1]: import scipy.constants as c > > scipy.constants ?? > > doesn't work for me. > > > > > In [2]: def acre2sqft(a): > > ...: return a * c.acre / (c.foot * c.foot) > > ...: > > > In [3]: acre2sqft(1) > > Out[3]: 43560.0 > > > Cheers, > > Bas > > Basically, he's saying that, instead of remembering the very simple "66" and "10" values, you can download and install a multi-megabyte gzipped tar file for the scipy project. ;-) (Of course, you get a few nice functions thrown in for free along with your constants, but downloading scipy for its constants is like choosing a sports car for its cupholders.)
From: monkeys paw on 9 Apr 2010 15:03 On 4/9/2010 2:40 PM, Patrick Maupin wrote: > On Apr 9, 1:22 pm, monkeys paw<mon...(a)joemoney.net> wrote: >> On 4/9/2010 3:43 AM, Bas wrote: >> >>> On Apr 7, 6:15 am, Patrick Maupin<pmau...(a)gmail.com> wrote: >>>> I should stop making a habit of responding to myself, BUT. This isn't >>>> quite an acre in square feet. I just saw the 43xxx and assumed it >>>> was, and then realized it couldn't be, because it wasn't divisible by >>>> 10. (I used to measure land with my grandfather with a 66 foot long >>>> chain, and learned at an early age that an acre was 1 chain by 10 >>>> chains, or 66 * 66 * 10 = 43560 sqft.) >>>> That's an exact number, and 208 is a poor approximation of its square >>>> root. >> >>> There is no need to remember those numbers for the imperially >>> challenged people: >> >>> In [1]: import scipy.constants as c >> >> scipy.constants ?? >> >> doesn't work for me. >> >> >> >>> In [2]: def acre2sqft(a): >>> ...: return a * c.acre / (c.foot * c.foot) >>> ...: >> >>> In [3]: acre2sqft(1) >>> Out[3]: 43560.0 >> >>> Cheers, >>> Bas >> >> > > Basically, he's saying that, instead of remembering the very simple > "66" and "10" values, you can download and install a multi-megabyte > gzipped tar file for the scipy project. ;-) > > (Of course, you get a few nice functions thrown in for free along with > your constants, but downloading scipy for its constants is like > choosing a sports car for its cupholders.) yea, the 66 foot chain story is a good one, i cant forget that. Appreciate the help, i just looked up the SciPY Project download, it is 40 MB. I'm gonna check it out none the less...
From: Albert van der Horst on 15 Apr 2010 11:55
In article <3790faeb-ae4c-4b45-b0a6-41cb32e46e41(a)k13g2000yqe.googlegroups.com>, Patrick Maupin <pmaupin(a)gmail.com> wrote: >On Apr 6, 11:10=A0pm, Patrick Maupin <pmau...(a)gmail.com> wrote: >> On Apr 6, 11:04=A0pm, Patrick Maupin <pmau...(a)gmail.com> wrote: >> >> >> >> > On Apr 6, 10:16=A0pm, monkeys paw <mon...(a)joemoney.net> wrote: >> >> > > I have the following acre meter which works for integers, >> > > how do i convert this to float? I tried >> >> > > return float ((208.0 * 208.0) * n) >> >> > > =A0>>> def s(n): >> > > ... =A0 =A0 return lambda x: (208 * 208) * n >> > > ... >> > > =A0>>> f =3D s(1) >> > > =A0>>> f(1) >> > > 43264 >> > > =A0>>> 208 * 208 >> > > 43264 >> > > =A0>>> f(.25) >> > > 43264 >> >> > Not sure why you are returning a lambda (which is just a function that >> > does not have a name) from an outer function. >> >> > A function that does this multiplication would simply be: >> >> > def s(n): >> > =A0 =A0 return 208.0 * 208.0 * n >> >> > Regards, >> > Pat >> >> I realized I didn't show the use. =A0A bit different than what you were >> doing: >> >> >>> def s(n): >> >> ... =A0 =A0 return 208.0 * 208.0 * n >> ...>>> s(1) >> 43264.0 >> >>> s(0.5) >> 21632.0 >> >>> s(3) >> >> 129792.0 >> >> I'm not sure exactly what you mean by "acre meter" though; this >> returns the number of square feet in 'n' acres. >> >> Regards, >> Pat > >I should stop making a habit of responding to myself, BUT. This isn't >quite an acre in square feet. I just saw the 43xxx and assumed it >was, and then realized it couldn't be, because it wasn't divisible by >10. (I used to measure land with my grandfather with a 66 foot long >chain, and learned at an early age that an acre was 1 chain by 10 >chains, or 66 * 66 * 10 =3D 43560 sqft.) >That's an exact number, and 208 is a poor approximation of its square >root. 208 = 2^6 * 13^2 66 = 2 * 3 * 11 Now I understand why the state of Wisconsin wants to drop out of the USA and join the EU ;-) > >Regards, >Pat Groetjes Albert -- -- Albert van der Horst, UTRECHT,THE NETHERLANDS Economic growth -- being exponential -- ultimately falters. albert(a)spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst |