Question: Got Error When Using Exomecnv To Call Loh
gravatar for Conan
6.6 years ago by
Conan20 wrote:

Hi all, I'm trying to use ExomeCNV for my paired normal-tumor exome sequencing data, to infer if there's any significant LOH in my tumor sample and if does, it'll be reasonable to use SNP array to do further LOH analysis. I followed user guide ( and created BAF files for samples, and called LOH on each heterozygous position. An error occured when following the step "Combine multiple positions into LOH segments":

the.loh = multi.LOH.analyze(normal, tumor,,test.alpha=0.001, method="variance.f", sdundo=c(0,0), alpha=c(0.5,0.1))

Analyzing: Sample.1 Error in sort(abs(diff(genomdat)))[1:n.keep] :

only 0's may be mixed with negative subscripts

so it means n.keep is negative? It's actually accomplished by package DNAcopy in this step, I've read the code's part where exactly stuck on website: but unfortunately still have no idea what should I do, is it correlated with BAF file which might be abnormal? Any advice would be really appreciated, thanks.

ADD COMMENTlink modified 15 months ago by ysh0 • written 6.6 years ago by Conan20
gravatar for Pascal
4.8 years ago by
European Union
Pascal250 wrote:

Hi Conan,

I got the same error. After removing extra chromosomes (I had GLXXXX included) everything worked fine.


ADD COMMENTlink written 4.8 years ago by Pascal250
gravatar for ysh
15 months ago by
ysh0 wrote:

found same error when using DNAcopy package recently, found out just some column is empty in input data.(table header is fine, but row below is not complete.

ADD COMMENTlink written 15 months ago by ysh0
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