ocaml - Loading a batteries dependent file into ocamltop -- the interfaces disagree -


here simple ocaml file, meant me understand how load program uses batteries library ocamltop.

batteryassault.ml

open batteries  let main = print_string "hello, world ... powered on"

i compile bytecode 

ocamlfind ocamlc -package batteries -linkpkg batteryassault.ml

resulting in batteryassault.cmo , batteryassault.cmi, , no errors nor warnings. then, start battery-powered ocamltop with

rlwrap ocamlfind batteries/ocaml

finally, load file in ocamltop:

#load "batteryassault.cmo" ;;

and error.

the files batteryassault.cmo , /usr/lib/ocaml/batteries/batteries.cma disagree on interface batteries

i think going on ubuntu installs batteries 2.2.1, reason (installing merlin?) have batteries 2.3.1 installed in opam folder, , moreover, when starting ocamltop batteries above, indicates ocamltop using 2.2.1 version. further, compiling 

ocamlfind ocamlc -package batteries -linkpkg batteryassault.ml -verbose

i find ocamlc using library in opam, i.e. 2.3.1 version.

so question is: the/is there workaround?

usually suggest remove system ocaml installation @ all. otherwise may have such errors.

you should ensure, tools , libraries come same source, in particular case opam.

a usual error forget call 

eval `opam config env`

at point. may recall later this, , activate opam, ending up, parts of application, or opam stack built using opam other parts built system libraries. if made such error, hard guess, when , goes wrong.

but if still don't want remove system batteries, need careful. example, since ocamlfind batteries/ocaml results in loading old version of batteries, can try use trick, make sure batteries topleve loaded opam:

$ `opam config var batteries:lib`/ocaml

if problem persists, means system broken. consider removing opam stack , making scratch. e.g.,

 rm -rf ~/.opam  opam init --comp=4.02.1  eval `opam config env`  opam install batteries

-

Popular posts from this blog

c# - ODP.NET Oracle.ManagedDataAccess causes ORA-12537 network session end of file -

overview i want replace oracle.dataaccess orcale. managed dataaccess, opening connection latter throws ora-12537 network session end of file exception. exception message / stack trace {oracleinternal.network.networkexception (0x000030f9): ora-12537 : netzwerksession: dateiende @ oracleinternal.network.readerstream.read(orabuf ob) @ oracleinternal.ttc.orabufreader.getdatafromnetwork() @ oracleinternal.ttc.orabufreader.read(boolean bignoredata) @ oracleinternal.ttc.marshallingengine.unmarshalub1(boolean bignoredata) @ oracleinternal.ttc.ttcprotocolnegotiation.readresponse()} i trying connect oracle 11g database , not have client installed on local machine. working test application (unmanaged) using oracle.dataaccess works fine . using system; using oracle.dataaccess.client; namespace app.odp.unmanaged { internal class program { private static void main(string[] args) { //dummy connection string
Read more

matlab - Compression and Decompression of ECG Signal using HUFFMAN ALGORITHM -

i want compress , decompress ecg signal stored text message text file , find out file size, cr,prd ratio,and qs. here code compression , decompression of ecg signal using huffman algorithm. i'm trying find out file size, compression ratio,prd ratio,qs. but error i'm getting the ecg file in text format. %clearing variables , screen enter code here clear all; close all; clc; [file1]=uigetfile('*.txt'); %fprintf('enter ecg file name :%s',file1); p=file1; t=sprintf('%s',p); b1=dlmread([file1]); len=length(b1); lead=input('enter lead number :'); %lead=str2double(lead); col2=b1(1:end,lead); e=fix(sqrt(len)); m=1; i=1:e j=1:e g2(i,j)=fix(col2(m)*1000); %amplifying 1000 m=m+1; end end g3=g2; i=1:e j=1:e
Read more

utf 8 - split utf-8 string into bytes in python -

i trying split utf-8 string bytes in python 3. problem is, when use bytearray, byte, encode etc functions array size of element 14 bytes, not 1 byte expected. need split text file sequence of bytes , send them byte after byte using sockets. tried this: infile = open (file, "r") str = infile.read() byte_str = bytes(str, 'utf-8') print("size of byte_str",sys.getsizeof(byte_str[0])) print gives me 14, need 1... suggestion? quoting official documentation : sys.getsizeof(object[, default]) return size of object in bytes. object can type of object. built-in objects return correct results, not have hold true third-party extensions implementation specific. only memory consumption directly attributed object accounted for, not memory consumption of objects refers to. if given, default returned if object not provide means retrieve size. otherwise typeerror raised. getsizeof() calls object’s __sizeof__ method , adds
Read more