R fitdistrplus : Issue in plotting - 'by' argument too much small -

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i understand issue plotting fitdistrplus object:

    ftnb = trycatch(expr = fitdist(unlist(x[,ftr]),distr="nbinom",discrete = true),                       error = function(err) {}) if (class(ftnb) %in% c("fitdist")) {   print(summary(ftnb))   plot(ftnb)) }

the summary of distribution fit follows:

fitting of distribution ' nbinom ' maximum likelihood parameters :            estimate std. error size 5.915112e-01         na mu   1.330646e+11         na loglikelihood:  -2543.973   aic:  5091.946   bic:  5097.074  correlation matrix: [1] na

i not see fit, see "na" in standard errors of 2 parameter estimates. plot command comes following error, understand:

error in seq.default(min(xval), max(xval), = 1) :   'by' argument small

please help.


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