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can't attach experts to charts

tonight my windows 10 has been updated: when I reopened it this morning, I noticed that my expert advisor had gone from the tables. when I tried to reattach it, it does... nothing! no error, simply it doesn't attach. I tried all the test experts, dragging them or left-click then selecting "attach to

last deal profit/loss

hi, I'm writing a neural network and need it to know if the last operation was successful. something like if [last deal generate profit] then x=0 if [last deal was at loss] then x=1 and possibly if [last 2 deals was at loss] then x=-1 what is the parameter can I use to find out the info I need

calculate maximus lot size?

hi... I'm not a trader: I'm a programmer and, starting from there , I created a nice little neural EA, tested it, and it work great! My problem is in the lot size: the original example program use the minimum size, like this lot_size= SymbolInfoDouble (my_symbol, SYMBOL_VOLUME_MIN ); that was good