Very, very, very bad solution.
as.matrix can change silently your data to unwanted format, complete.cases()==T
is silly as Peter already pointed out.
I use
head(airquality[ ,colSums(is.na(airquality))==0])
Wind Temp Month Day
1 7.4 67 5 1
2 8.0 72 5 2
3 12.6 74 5 3
4 11.5 62 5 4
5 14.3 56 5 5
6 14.9 66 5 6
if I want to get rid of columns with NA.
Cheers
Petr
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of St?phane
Adamowicz
Sent: Friday, March 27, 2015 11:42 AM
To: peter dalgaard
Cc: r-help at r-project.org
Subject: Re: [R] matrix manipulation question
Well, it seems to work with me.
Y <- as.matrix(airquality)
head(Y, n=8)
Ozone Solar.R Wind Temp Month Day
[1,] 41 190 7.4 67 5 1
[2,] 36 118 8.0 72 5 2
[3,] 12 149 12.6 74 5 3
[4,] 18 313 11.5 62 5 4
[5,] NA NA 14.3 56 5 5
[6,] 28 NA 14.9 66 5 6
[7,] 23 299 8.6 65 5 7
[8,] 19 99 13.8 59 5 8
Z <- Y[,complete.cases(t(Y))==T]
head(Z, n=8)
Wind Temp Month Day
[1,] 7.4 67 5 1
[2,] 8.0 72 5 2
[3,] 12.6 74 5 3
[4,] 11.5 62 5 4
[5,] 14.3 56 5 5
[6,] 14.9 66 5 6
[7,] 8.6 65 5 7
[8,] 13.8 59 5 8
The columns that contained NA were deleted.
Le 27 mars 2015 ? 10:38, peter dalgaard <pdalgd at gmail.com<mailto:pdalgd
at gmail.com>> a ?crit :
>
> On 27 Mar 2015, at 09:58 , St?phane Adamowicz <stephane.adamowicz at
avignon.inra.fr<mailto:stephane.adamowicz at avignon.inra.fr>> wrote:
>
>> data_no_NA <- data[, complete.cases(t(data))==T]
>
> Ouch! logical == TRUE is bad, logical == T is worse:
>
> data[, complete.cases(t(data))]
>
>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Office: A 4.23
> Email: pd.mes at cbs.dk<mailto:pd.mes at cbs.dk> Priv: PDalgd at
gmail.com<mailto:PDalgd at gmail.com>
>
>
>
>
>
>
>
>
>
_________________________________
St?phane Adamowicz
Inra, centre de recherche Paca, unit? PSH
228, route de l'a?rodrome
CS 40509
domaine St Paul, site Agroparc
84914 Avignon, cedex 9
France
stephane.adamowicz at avignon.inra.fr<mailto:stephane.adamowicz at
avignon.inra.fr>
tel. +33 (0)4 32 72 24 35
fax. +33 (0)4 32 72 24 32
do not dial 0 when out of France
web PSH : https://www6.paca.inra.fr/psh
web Inra : http://www.inra.fr/
_________________________________
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Le 27 mars 2015 ? 12:34, PIKAL Petr <petr.pikal at precheza.cz> a ?crit :> Very, very, very bad solution. > > as.matrix can change silently your data to unwanted format, complete.cases()==T is silly as Peter already pointed out. > >Perhaps, but it happens that in the original message, the question dealt with a matrix not a dataframe, and thus I needed a matrix example. Furthermore in my example no unwanted format occurred. You can check easily that the final matrix contains only ? numeric ? data as in the original data frame. St?phane> > > > > > > > > > > > > > _________________________________ > St?phane Adamowicz > Inra, centre de recherche Paca, unit? PSH > 228, route de l'a?rodrome > CS 40509 > domaine St Paul, site Agroparc > 84914 Avignon, cedex 9 > France > > stephane.adamowicz at avignon.inra.fr > tel. +33 (0)4 32 72 24 35 > fax. +33 (0)4 32 72 24 32 > do not dial 0 when out of France > web PSH : https://www6.paca.inra.fr/psh > web Inra : http://www.inra.fr/ > _________________________________ > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny pouze jeho adres?t?m. > Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho syst?mu. > Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. > Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi ?i zpo?d?n?m p?enosu e-mailu. > > V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?: > - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu. > - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany p??jemce s dodatkem ?i odchylkou. > - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech. > - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? zn?m?. > > This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients. > If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system. > If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner. > The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email. > > In case that this e-mail forms part of business dealings: > - the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning. > - if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation. > - the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects. > - the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.
Hi> -----Original Message----- > From: St?phane Adamowicz [mailto:stephane.adamowicz at avignon.inra.fr] > Sent: Friday, March 27, 2015 1:26 PM > To: PIKAL Petr > Cc: peter dalgaard; r-help at r-project.org > Subject: Re: [R] matrix manipulation question > > > Le 27 mars 2015 ? 12:34, PIKAL Petr <petr.pikal at precheza.cz> a ?crit : > > > Very, very, very bad solution. > > > > as.matrix can change silently your data to unwanted format, > complete.cases()==T is silly as Peter already pointed out. > > > > > > Perhaps, but it happens that in the original message, the questionI do not have original message.> dealt with a matrix not a dataframe, and thus I needed a matrixBut you made matrix from data frame. If one column was not numeric all resulting matrix would chnge to nonnumeric format.> example. Furthermore in my example no unwanted format occurred. You canYes because data.frame was (luckily) numeric.> check easily that the final matrix contains only ? numeric ? data as in > the original data frame.You want matrix? Here it is.> head(as.matrix(airquality)[ ,colSums(is.na(airquality))==0])Wind Temp Month Day [1,] 7.4 67 5 1 [2,] 8.0 72 5 2 [3,] 12.6 74 5 3 [4,] 11.5 62 5 4 [5,] 14.3 56 5 5 [6,] 14.9 66 5 6 Works same with matrix as with data frame without need to transform it. Cheers Petr> > St?phane > > > > > > > > > > > > > > > > > > > > > > > _________________________________ > > St phane Adamowicz > > Inra, centre de recherche Paca, unit PSH 228, route de l'a rodrome > CS > > 40509 domaine St Paul, site Agroparc > > 84914 Avignon, cedex 9 > > France > > > > stephane.adamowicz at avignon.inra.fr > > tel. +33 (0)4 32 72 24 35 > > fax. +33 (0)4 32 72 24 32 > > do not dial 0 when out of France > > web PSH : https://www6.paca.inra.fr/psh web Inra : > > http://www.inra.fr/ _________________________________ > > > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > > > Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a > jsou ur?eny pouze jeho adres?t?m. > > Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? > neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho > kopie vyma?te ze sv?ho syst?mu. > > Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento > email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. > > Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou > modifikacemi ?i zpo?d?n?m p?enosu e-mailu. > > > > V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?: > > - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? > smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu. > > - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? > p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky > ze strany p??jemce s dodatkem ?i odchylkou. > > - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve > v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech. > > - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za > spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? > zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly > adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, > p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? > zn?m?. > > > > This e-mail and any documents attached to it may be confidential and > are intended only for its intended recipients. > > If you received this e-mail by mistake, please immediately inform its > sender. Delete the contents of this e-mail with all attachments and its > copies from your system. > > If you are not the intended recipient of this e-mail, you are not > authorized to use, disseminate, copy or disclose this e-mail in any > manner. > > The sender of this e-mail shall not be liable for any possible damage > caused by modifications of the e-mail or by delay with transfer of the > email. > > > > In case that this e-mail forms part of business dealings: > > - the sender reserves the right to end negotiations about entering > into a contract in any time, for any reason, and without stating any > reasoning. > > - if the e-mail contains an offer, the recipient is entitled to > immediately accept such offer; The sender of this e-mail (offer) > excludes any acceptance of the offer on the part of the recipient > containing any amendment or variation. > > - the sender insists on that the respective contract is concluded > only upon an express mutual agreement on all its aspects. > > - the sender of this e-mail informs that he/she is not authorized to > enter into any contracts on behalf of the company except for cases in > which he/she is expressly authorized to do so in writing, and such > authorization or power of attorney is submitted to the recipient or the > person represented by the recipient, or the existence of such > authorization is known to the recipient of the person represented by > the recipient.________________________________ Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a jsou ur?eny pouze jeho adres?t?m. Jestli?e jste obdr?el(a) tento e-mail omylem, informujte laskav? neprodlen? jeho odes?latele. Obsah tohoto emailu i s p??lohami a jeho kopie vyma?te ze sv?ho syst?mu. Nejste-li zam??len?m adres?tem tohoto emailu, nejste opr?vn?ni tento email jakkoliv u??vat, roz?i?ovat, kop?rovat ?i zve?ej?ovat. Odes?latel e-mailu neodpov?d? za eventu?ln? ?kodu zp?sobenou modifikacemi ?i zpo?d?n?m p?enosu e-mailu. V p??pad?, ?e je tento e-mail sou??st? obchodn?ho jedn?n?: - vyhrazuje si odes?latel pr?vo ukon?it kdykoliv jedn?n? o uzav?en? smlouvy, a to z jak?hokoliv d?vodu i bez uveden? d?vodu. - a obsahuje-li nab?dku, je adres?t opr?vn?n nab?dku bezodkladn? p?ijmout; Odes?latel tohoto e-mailu (nab?dky) vylu?uje p?ijet? nab?dky ze strany p??jemce s dodatkem ?i odchylkou. - trv? odes?latel na tom, ?e p??slu?n? smlouva je uzav?ena teprve v?slovn?m dosa?en?m shody na v?ech jej?ch n?le?itostech. - odes?latel tohoto emailu informuje, ?e nen? opr?vn?n uzav?rat za spole?nost ??dn? smlouvy s v?jimkou p??pad?, kdy k tomu byl p?semn? zmocn?n nebo p?semn? pov??en a takov? pov??en? nebo pln? moc byly adres?tovi tohoto emailu p??padn? osob?, kterou adres?t zastupuje, p?edlo?eny nebo jejich existence je adres?tovi ?i osob? j?m zastoupen? zn?m?. This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients. If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system. If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner. The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email. In case that this e-mail forms part of business dealings: - the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning. - if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation. - the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects. - the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.