Error in chapter five, code chunk 6 about geocompr HOT 8 CLOSED

Hi @manab-prakash -- I am unable to reproduce your issue. Please try to run the code below and let me know if it fails.

library(spData)
library(sf)
#> Linking to GEOS 3.12.1, GDAL 3.7.3, PROJ 9.2.1; sf_use_s2() is TRUE
us_states_simp2 = rmapshaper::ms_simplify(us_states, keep = 0.01,
                                          keep_shapes = TRUE)
#> Warning in ms_de_unit(input): Coercing these 'units' columns to class numeric:
#> AREA

^{Created on 2024-03-09 with reprex v2.0.2}

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Works fine for me too so closing for now.

from geocompr.

from geocompr.

Have you tried to run the code as one line? This error does not sound like an R error, but an external one...

library(spData)
library(sf)
us_states_simp2 = rmapshaper::ms_simplify(us_states, keep = 0.01, keep_shapes = TRUE)

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rmapshaper::ms_simplify(us_states, keep = 0.01,+

Could the + be an issue?

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from geocompr.

Another idea, @manab-prakash -- are you using the current source code of the book? We do not have an object us_states2163 anymore in the book...

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Yes, I tried the newer version too. The result is the same. The source of the error seems to be from C++. It is definitely not an issue from geocompr. The complete traceback is:

traceback()
10: stop(structure(list(message = "SyntaxError: Unexpected token '.'",
call = NULL, cppstack = NULL), class = c("std::invalid_argument",
"C++Error", "error", "condition")))
9: context_eval(join(src), private$context, serialize, await)
8: get_str_output(context_eval(join(src), private$context, serialize,
await))
7: evaluate_js(readLines(file, encoding = "UTF-8", warn = FALSE))
6: ctx$source(system.file("mapshaper/mapshaper-browserify.min.js",
package = "rmapshaper"))
5: ms_make_ctx()
4: apply_mapshaper_commands(data = geojson, command = call, force_FC = TRUE,
sys = sys, sys_mem = sys_mem, quiet = quiet)
3: ms_sf(input, call, ...)
2: ms_simplify.sf(us_states, keep = 0.01, keep_shapes = TRUE)
1: rmapshaper::ms_simplify(us_states, keep = 0.01, keep_shapes = TRUE)

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