R help - Feb 2018 - gdistance::shortestPath throws error "not a symmetric matrix"

Hi,

Calling

  gdistance::shortestPath

gives me the error

  Error in asMethod(object) : 
    not a symmetric matrix; consider forceSymmetric() or symmpart()

The output of dput(.traceback()) is

  pairlist("stop(\"not a symmetric matrix; consider forceSymmetric()
or symmpart()\")",
  "asMethod(object)",
  "as(Laplacian,\"symmetricMatrix\")",
  ".Laplacian(x)", ".flowMap(x, ci, cj, tc)",
  ".local(x, origin, goal, ...)",
  c("passage(conduct_Tobler, origin =sites at coords[5, ], goal = sites at
coords[3, ", " ])"),
  c("passage(conduct_Tobler, origin = sites at coords[5, ], goal = sites at
coords[3, ", " ])"),
  "eval(ei, envir)", "eval(ei, envir)",
  "withVisible(eval(ei, envir))",
  "source(\"./Skript.R\")")

Is that enough for anyone to point me in the right direction?

I am aware that this question would be probably better posted on
r-sig-geo, but as I am just an HPC janitor trying to help a customer and
am not a geo-scientist myself, I thought I'd ask here first before
signing up to (yet another) list.

Cheers,

Loris

-- 
Dr. Loris Bennett (Mr.)
ZEDAT, Freie Universit?t Berlin         Email loris.bennett at fu-berlin.de

It is really hard to help you fix a function usage error if you don't show
us how you used the function. [1][2][3]

As for helping a customer by asking for help on the wrong list... you are not an
expert on the topic, and are asking a group that might or might not know the
theory behind your question. You might achieve success, but it might also be
better to remove at least one handicap by either or both strategies of having
the customer ask themselves or asking on the right list.

[1]
http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example

[2] http://adv-r.had.co.nz/Reproducibility.html

[3] https://cran.r-project.org/web/packages/reprex/index.html (read the
vignette)
-- 
Sent from my phone. Please excuse my brevity.

On February 6, 2018 6:01:08 AM PST, Loris Bennett <loris.bennett at
fu-berlin.de> wrote:
>Hi,
>
>Calling
>
>  gdistance::shortestPath
>
>gives me the error
>
>  Error in asMethod(object) : 
>    not a symmetric matrix; consider forceSymmetric() or symmpart()
>
>The output of dput(.traceback()) is
>
>pairlist("stop(\"not a symmetric matrix; consider forceSymmetric()
or
>symmpart()\")",
>  "asMethod(object)",
>  "as(Laplacian,\"symmetricMatrix\")",
>  ".Laplacian(x)", ".flowMap(x, ci, cj, tc)",
>  ".local(x, origin, goal, ...)",
>c("passage(conduct_Tobler, origin =sites at coords[5, ], goal >sites
at coords[3, ", " ])"),
>c("passage(conduct_Tobler, origin = sites at coords[5, ], goal
>sites at coords[3, ", " ])"),
>  "eval(ei, envir)", "eval(ei, envir)",
>  "withVisible(eval(ei, envir))",
>  "source(\"./Skript.R\")")
>
>Is that enough for anyone to point me in the right direction?
>
>I am aware that this question would be probably better posted on
>r-sig-geo, but as I am just an HPC janitor trying to help a customer
>and
>am not a geo-scientist myself, I thought I'd ask here first before
>signing up to (yet another) list.
>
>Cheers,
>
>Loris