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Subtracting a matrix 1x28 from a scalar

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meredith

Subtracting a matrix 1x28 from a scalar

Afternoon-
I am trying to subtract a matrix, basically a vector of 28 values, each by the same number to account for differences in regression fitting. I am taking the 1x28 and minus it by the mean value of the matrix, each number. The result I receive is a 1X29 matrix. Does anyone know why the result has an extra value?

> lffeb_march
[1] 6.588926 7.663877 6.917706 6.824374 7.029973 6.549651 6.517671 6.070738 5.916202
[10] 6.993933 6.091310 7.313220 5.135798 6.762730 6.381816 7.999679 6.851185 5.799093
[19] 7.774856 6.956545 8.218787 8.218787 7.549609 7.222566 7.170120 6.173786 5.075174
[28] 4.700480 6.672033 5.198497 4.867534 7.170120 6.131226 6.802395
> meanf_fm<-mean(lffeb_march)
> X3_fm<-(lffeb_march-meanf_fm)
> X3_fm
[1] -0.03784990 1.03710088 0.29092923 0.19759729 0.40319653 -0.07712564 -0.10910511
[8] -0.55603865 -0.71057432 0.36715660 -0.53546650 0.68644401 -1.49097794 0.13595313
[15] -0.24496036 1.37290220 0.22440855 -0.82768372 1.14807939 0.32976906 1.59201078
[22] 1.59201078 0.92283279 0.59578964 0.54334317 -0.45299027 -1.55160256 -1.92629601
[29] 0.04525657 -1.42827935 -1.75924193 0.54334317 -0.49554989 0.17561839

Thanks for the help
Meredith

David Winsemius

Re: Subtracting a matrix 1x28 from a scalar

On May 7, 2012, at 3:26 PM, meredith wrote:

> Afternoon-
> I am trying to subtract a matrix, basically a vector of 28 values,
> each by
> the same number to account for differences in regression fitting. I am
> taking the 1x28 and minus it by the mean value of the matrix, each
> number.
> The result I receive is a 1X29 matrix.

No. You simply do not understand what you are looking at that is NOT a
matrix, but rather a 34 element vector. The [28] and hte [29] refer to
the item location of the succeeding value.

--
David.

> Does anyone know why the result has
> an extra value?
>
>> lffeb_march
> [1] 6.588926 7.663877 6.917706 6.824374 7.029973 6.549651 6.517671
> 6.070738
> 5.916202
> [10] 6.993933 6.091310 7.313220 5.135798 6.762730 6.381816 7.999679
> 6.851185
> 5.799093
> [19] 7.774856 6.956545 8.218787 8.218787 7.549609 7.222566 7.170120
> 6.173786
> 5.075174
> [28] 4.700480 6.672033 5.198497 4.867534 7.170120 6.131226 6.802395
>> meanf_fm<-mean(lffeb_march)
>> X3_fm<-(lffeb_march-meanf_fm)
>> X3_fm
> [1] -0.03784990 1.03710088 0.29092923 0.19759729 0.40319653
> -0.07712564
> -0.10910511
> [8] -0.55603865 -0.71057432 0.36715660 -0.53546650 0.68644401
> -1.49097794
> 0.13595313
> [15] -0.24496036 1.37290220 0.22440855 -0.82768372 1.14807939
> 0.32976906
> 1.59201078
> [22] 1.59201078 0.92283279 0.59578964 0.54334317 -0.45299027
> -1.55160256
> -1.92629601
> [29] 0.04525657 -1.42827935 -1.75924193 0.54334317 -0.49554989
> 0.17561839
>
> Thanks for the help
> Meredith
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Subtracting-a-matrix-1x28-from-a-scalar-tp4615590.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> [hidden email] mailing list
> 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.

David Winsemius, MD
West Hartford, CT

______________________________________________
[hidden email] mailing list
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.

meredith

Re: Subtracting a matrix 1x28 from a scalar

In reply to this post by meredith

Disregard message please

Afternoon-
I am trying to subtract a matrix, basically a vector of 28 values, each by the same number to account for differences in regression fitting. I am taking the 1x28 and minus it by the mean value of the matrix, each number. The result I receive is a 1X29 matrix. Does anyone know why the result has an extra value?

> lffeb_march
[1] 6.588926 7.663877 6.917706 6.824374 7.029973 6.549651 6.517671 6.070738 5.916202
[10] 6.993933 6.091310 7.313220 5.135798 6.762730 6.381816 7.999679 6.851185 5.799093
[19] 7.774856 6.956545 8.218787 8.218787 7.549609 7.222566 7.170120 6.173786 5.075174
[28] 4.700480 6.672033 5.198497 4.867534 7.170120 6.131226 6.802395
> meanf_fm<-mean(lffeb_march)
> X3_fm<-(lffeb_march-meanf_fm)
> X3_fm
[1] -0.03784990 1.03710088 0.29092923 0.19759729 0.40319653 -0.07712564 -0.10910511
[8] -0.55603865 -0.71057432 0.36715660 -0.53546650 0.68644401 -1.49097794 0.13595313
[15] -0.24496036 1.37290220 0.22440855 -0.82768372 1.14807939 0.32976906 1.59201078
[22] 1.59201078 0.92283279 0.59578964 0.54334317 -0.45299027 -1.55160256 -1.92629601
[29] 0.04525657 -1.42827935 -1.75924193 0.54334317 -0.49554989 0.17561839

Thanks for the help
Meredith

John Kane

Re: Subtracting a matrix 1x28 from a scalar

In reply to this post by meredith

I'm sorry but where is 28 coming from? It looks to me like you have a vector of length 34 and the result is of length 34. Oh, I see, the 28 and 29 are the indices for the first number on the line not the total length.

John Kane
Kingston ON Canada

> -----Original Message-----
> From: [hidden email]
> Sent: Mon, 7 May 2012 12:26:15 -0700 (PDT)
> To: [hidden email]
> Subject: [R] Subtracting a matrix 1x28 from a scalar
>
> Afternoon-
> I am trying to subtract a matrix, basically a vector of 28 values, each
> by
> the same number to account for differences in regression fitting. I am
> taking the 1x28 and minus it by the mean value of the matrix, each
> number.
> The result I receive is a 1X29 matrix. Does anyone know why the result
> has
> an extra value?
>
>> lffeb_march
> [1] 6.588926 7.663877 6.917706 6.824374 7.029973 6.549651 6.517671
> 6.070738
> 5.916202
> [10] 6.993933 6.091310 7.313220 5.135798 6.762730 6.381816 7.999679
> 6.851185
> 5.799093
> [19] 7.774856 6.956545 8.218787 8.218787 7.549609 7.222566 7.170120
> 6.173786
> 5.075174
> [28] 4.700480 6.672033 5.198497 4.867534 7.170120 6.131226 6.802395
>> meanf_fm<-mean(lffeb_march)
>> X3_fm<-(lffeb_march-meanf_fm)
>> X3_fm
> [1] -0.03784990 1.03710088 0.29092923 0.19759729 0.40319653
> -0.07712564
> -0.10910511
> [8] -0.55603865 -0.71057432 0.36715660 -0.53546650 0.68644401
> -1.49097794
> 0.13595313
> [15] -0.24496036 1.37290220 0.22440855 -0.82768372 1.14807939
> 0.32976906
> 1.59201078
> [22] 1.59201078 0.92283279 0.59578964 0.54334317 -0.45299027
> -1.55160256
> -1.92629601
> [29] 0.04525657 -1.42827935 -1.75924193 0.54334317 -0.49554989
> 0.17561839
>
> Thanks for the help
> Meredith
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/Subtracting-a-matrix-1x28-from-a-scalar-tp4615590.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> [hidden email] mailing list
> 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.

____________________________________________________________
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______________________________________________
[hidden email] mailing list
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.

John Kane

Re: Subtracting a matrix 1x28 from a scalar

In reply to this post by meredith

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______________________________________________
[hidden email] mailing list
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.

Rui Barradas

Re: Subtracting a matrix 1x28 from a scalar

In reply to this post by meredith

Hello,

meredith wrote

Afternoon-
I am trying to subtract a matrix, basically a vector of 28 values, each by the same number to account for differences in regression fitting. I am taking the 1x28 and minus it by the mean value of the matrix, each number. The result I receive is a 1X29 matrix. Does anyone know why the result has an extra value?

> lffeb_march
[1] 6.588926 7.663877 6.917706 6.824374 7.029973 6.549651 6.517671 6.070738 5.916202
[10] 6.993933 6.091310 7.313220 5.135798 6.762730 6.381816 7.999679 6.851185 5.799093
[19] 7.774856 6.956545 8.218787 8.218787 7.549609 7.222566 7.170120 6.173786 5.075174
[28] 4.700480 6.672033 5.198497 4.867534 7.170120 6.131226 6.802395
> meanf_fm<-mean(lffeb_march)
> X3_fm<-(lffeb_march-meanf_fm)
> X3_fm
[1] -0.03784990 1.03710088 0.29092923 0.19759729 0.40319653 -0.07712564 -0.10910511
[8] -0.55603865 -0.71057432 0.36715660 -0.53546650 0.68644401 -1.49097794 0.13595313
[15] -0.24496036 1.37290220 0.22440855 -0.82768372 1.14807939 0.32976906 1.59201078
[22] 1.59201078 0.92283279 0.59578964 0.54334317 -0.45299027 -1.55160256 -1.92629601
[29] 0.04525657 -1.42827935 -1.75924193 0.54334317 -0.49554989 0.17561839

Thanks for the help
Meredith

Each of your two vectors has 34 elements, not 28 and 29.
And when I suntract mean( lffeb_march) from lffeb_march (the first vector)
I get a vector close but not equal to your second vector. It's off by 1e-7 or 1e-8, mostly 1e-7.

The function all.equal() gives
[1] "Mean relative difference: 3.568577e-07"

So, please, revise your results.

(You should use dput(lffeb_march) to post your data.)

Hope this helps,

Rui Barradas