[Rd] formatting of complex matrix
Duncan Murdoch
murdoch.duncan at gmail.com
Fri Mar 18 11:24:08 CET 2016
On 18/03/2016 6:09 AM, Lukas Stadler wrote:
> While working on the printing code, my colleague Zbyněk Šlajchrt noticed that complex matrixes are sometimes misaligned:
>
>> { matrix(1i,2,13) }
> [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13]
> [1,] 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i
> [2,] 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i 0+1i
>
> (the values in the last four columns should be prefixed by two spaces instead of one)
> while the formatting is fine, e.g., for real values:
>
>> { matrix(1,2,13) }
> [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13]
> [1,] 1 1 1 1 1 1 1 1 1 1 1 1 1
> [2,] 1 1 1 1 1 1 1 1 1 1 1 1 1
>
> The problem seems to be in printarray.c:275 (https://github.com/wch/r-source/blob/trunk/src/main/printarray.c#L275):
> EncodeComplex(x[i + j * r],
> wr[j] + R_print.gap, dr[j], er[j],
> wi[j], di[j], ei[j], OutDec)) )
>
> The width of the real part wr[j] + the width of the imaginary part wi[j] + R_print.gap doesn’t always add up to the width of the column w[j].
>
> As far as we can see, calculating the width of the real part on the fly fixes the problem:
> EncodeComplex(x[i + j * r],
> w[j] - wi[j] - 2, dr[j], er[j],
> wi[j], di[j], ei[j], OutDec)) )
Thanks, I'll take a look.
Duncan Murdoch
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