Thanks to you both. Calling recover (an option hitherto unknown to me) helped
me identify the problem.
For the record, the error occurred in the geom_path() line, not the list
concatenation, as I had previously thought. It was a logic problem: when
typeof == NULL the function jumped, but i remaine
You should have the following statement as part of your startup for R:
options(error=utils::recover)
When an error occurs, you will be at the stack frame where is happens
and you can examine the values of the variables that you are using and
this should help a lot in tracking down your problem.
On 2012-04-04 14:25, z2.0 wrote:
json_dir is a list of JSON lists mapping lat/long route points between
locations using CloudMade's API.
post_url is the URL of the HTTP request
for (n in json_dir) {
i = i + 1
if (typeof(json_dir[[i]]) != "NULL") {
if
json_dir is a list of JSON lists mapping lat/long route points between
locations using CloudMade's API.
post_url is the URL of the HTTP request
for (n in json_dir) {
i = i + 1
if (typeof(json_dir[[i]]) != "NULL") {
if (i == 1) {
dat_add
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