How can I convert a data frame into 3-D matrix with the values of two columns of data frame forming column...





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1















Let's say I have following dataframe

A B C C
a 1 ca da
b 2 cb db
c 3 cc dc



I want to convert above to the form .

[,,1]

a b c
1 ca 0 0
2 0 cb 0
3 0 0 cc



[,,2]

a b c
1 da 0 0
2 0 db 0
3 0 0 dc






r dataframe







share|improve this question

























  • not sure this is exactly what you want (its not 3D) but ... reshape2::dcast(data=dat, B ~ A, value.var="C", fill=0)

    – user20650
    Nov 23 '18 at 23:21













  • @user20650 Can you give one more look

    – Amb
    Nov 23 '18 at 23:29











  • I'm not sure. I must admit, the fact you are using matrices/arrays to mix characters and zeros makes this a wee bit weird ;)

    – user20650
    Nov 23 '18 at 23:33






  • 1





    okay, here is a monster! simplify2array(lapply(c("C", "D"), function(i) reshape2::acast(data=dat, B ~ A , value.var=i, fill=0)))

    – user20650
    Nov 23 '18 at 23:39






  • 1





    @user20650 Wow! It works. Thanks! Now, time for me to understand how it works

    – Amb
    Nov 23 '18 at 23:48




















1















Let's say I have following dataframe

A B C C
a 1 ca da
b 2 cb db
c 3 cc dc



I want to convert above to the form .

[,,1]

a b c
1 ca 0 0
2 0 cb 0
3 0 0 cc



[,,2]

a b c
1 da 0 0
2 0 db 0
3 0 0 dc






r dataframe







share|improve this question

























  • not sure this is exactly what you want (its not 3D) but ... reshape2::dcast(data=dat, B ~ A, value.var="C", fill=0)

    – user20650
    Nov 23 '18 at 23:21













  • @user20650 Can you give one more look

    – Amb
    Nov 23 '18 at 23:29











  • I'm not sure. I must admit, the fact you are using matrices/arrays to mix characters and zeros makes this a wee bit weird ;)

    – user20650
    Nov 23 '18 at 23:33






  • 1





    okay, here is a monster! simplify2array(lapply(c("C", "D"), function(i) reshape2::acast(data=dat, B ~ A , value.var=i, fill=0)))

    – user20650
    Nov 23 '18 at 23:39






  • 1





    @user20650 Wow! It works. Thanks! Now, time for me to understand how it works

    – Amb
    Nov 23 '18 at 23:48
















1












1








1


2






Let's say I have following dataframe

A B C C
a 1 ca da
b 2 cb db
c 3 cc dc



I want to convert above to the form .

[,,1]

a b c
1 ca 0 0
2 0 cb 0
3 0 0 cc



[,,2]

a b c
1 da 0 0
2 0 db 0
3 0 0 dc






r dataframe







share|improve this question
















Let's say I have following dataframe

A B C C
a 1 ca da
b 2 cb db
c 3 cc dc



I want to convert above to the form .

[,,1]

a b c
1 ca 0 0
2 0 cb 0
3 0 0 cc



[,,2]

a b c
1 da 0 0
2 0 db 0
3 0 0 dc






r dataframe




r dataframe






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 23 '18 at 23:28







Amb

















asked Nov 23 '18 at 23:10









AmbAmb

193




193













  • not sure this is exactly what you want (its not 3D) but ... reshape2::dcast(data=dat, B ~ A, value.var="C", fill=0)

    – user20650
    Nov 23 '18 at 23:21













  • @user20650 Can you give one more look

    – Amb
    Nov 23 '18 at 23:29











  • I'm not sure. I must admit, the fact you are using matrices/arrays to mix characters and zeros makes this a wee bit weird ;)

    – user20650
    Nov 23 '18 at 23:33






  • 1





    okay, here is a monster! simplify2array(lapply(c("C", "D"), function(i) reshape2::acast(data=dat, B ~ A , value.var=i, fill=0)))

    – user20650
    Nov 23 '18 at 23:39






  • 1





    @user20650 Wow! It works. Thanks! Now, time for me to understand how it works

    – Amb
    Nov 23 '18 at 23:48





















  • not sure this is exactly what you want (its not 3D) but ... reshape2::dcast(data=dat, B ~ A, value.var="C", fill=0)

    – user20650
    Nov 23 '18 at 23:21













  • @user20650 Can you give one more look

    – Amb
    Nov 23 '18 at 23:29











  • I'm not sure. I must admit, the fact you are using matrices/arrays to mix characters and zeros makes this a wee bit weird ;)

    – user20650
    Nov 23 '18 at 23:33






  • 1





    okay, here is a monster! simplify2array(lapply(c("C", "D"), function(i) reshape2::acast(data=dat, B ~ A , value.var=i, fill=0)))

    – user20650
    Nov 23 '18 at 23:39






  • 1





    @user20650 Wow! It works. Thanks! Now, time for me to understand how it works

    – Amb
    Nov 23 '18 at 23:48



















not sure this is exactly what you want (its not 3D) but ... reshape2::dcast(data=dat, B ~ A, value.var="C", fill=0)

– user20650
Nov 23 '18 at 23:21







not sure this is exactly what you want (its not 3D) but ... reshape2::dcast(data=dat, B ~ A, value.var="C", fill=0)

– user20650
Nov 23 '18 at 23:21















@user20650 Can you give one more look

– Amb
Nov 23 '18 at 23:29





@user20650 Can you give one more look

– Amb
Nov 23 '18 at 23:29













I'm not sure. I must admit, the fact you are using matrices/arrays to mix characters and zeros makes this a wee bit weird ;)

– user20650
Nov 23 '18 at 23:33





I'm not sure. I must admit, the fact you are using matrices/arrays to mix characters and zeros makes this a wee bit weird ;)

– user20650
Nov 23 '18 at 23:33




1




1





okay, here is a monster! simplify2array(lapply(c("C", "D"), function(i) reshape2::acast(data=dat, B ~ A , value.var=i, fill=0)))

– user20650
Nov 23 '18 at 23:39





okay, here is a monster! simplify2array(lapply(c("C", "D"), function(i) reshape2::acast(data=dat, B ~ A , value.var=i, fill=0)))

– user20650
Nov 23 '18 at 23:39




1




1





@user20650 Wow! It works. Thanks! Now, time for me to understand how it works

– Amb
Nov 23 '18 at 23:48







@user20650 Wow! It works. Thanks! Now, time for me to understand how it works

– Amb
Nov 23 '18 at 23:48














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