Hi,

I am trying to submit a form to the EXPASY protscale server (
http://www.expasy.ch/tools/protscale.html). I am using the RCurl package and
the postForm function available in it. I have extracted the variables for
the form from the HTML source page. According to the syntax of postForm, I
just need to mention the url and assign values to the input mentioned in the
HTML code.
The code that I am using is:
postForm("http://www.expasy.ch/tools/protscale.html",
    "sequence" = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",
    scale = "Molecular weight",
    window = "5",
    weight_edges = "100",
    weight_var = "linear",
    norm = "no",
    submit = "Submit"), .checkparams = TRUE)
the constant error that I get is:
Error in postForm("http://www.expasy.ch/tools/protscale.html", .params =
list(sequence = "not",  :  STRING_ELT() can only be applied to a 'character
vector', not a 'logical'

Is there any other way to submit an HTML form in R ?

Thanks for the help

Regards

Sunando

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