list.mylist.nextvalue causes strange errors: Expression 'text' is invalid. Expression contains an...


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Sercan
Sercan
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Group: Forum Members
Posts: 10, Visits: 44
I build a list, like so:

<list category1>
/ items = ("01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16")
/ replace = false
</list>

<list category2>
/ items = ("17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32")
/ replace = false
</list>

<list catalogue>
</list>

<values listbuilder>
/ delaytype = -1
/ ct = 0
/ ct2 = 0
/ tester = "..."
</values>

<block listbuilder>
/ trials = [1=listbuilder]
</block>

<trial listbuilder>
/ ontrialbegin = [
    values.delaytype+=1;
    values.ct+=1;
    if(values.delaytype==4){
        values.delaytype=0;
        list.catalogue.appenditem(concat(concat(values.delaytype,"F"),list.category1.nextvalue));
        list.catalogue.appenditem(concat(concat(values.delaytype,"O"),list.category2.nextvalue))
    }else{
        list.catalogue.appenditem(concat(concat(values.delaytype,"F"),list.category1.currentvalue));
        list.catalogue.appenditem(concat(concat(values.delaytype,"O"),list.category2.currentvalue));
    }
]
/ timeout=0
/ branch=[
    if(values.ct < 16*4){
        trial.listbuilder
    }
]
</trial>


However, any subsequent call to list.catalogue.nextvalue causes an error and does not provide the next value. It says:

element: list.catalogue
attribute: nextvalue
message: Expression '2F10' is invalid. Expression contains an unknown element or property name.



It seems like Inquisit is trying to parse the list item... but I merely want to assign the item as a string to a variable. What should I do?

Dave
Dave
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Group: Administrators
Posts: 10K, Visits: 59K
Sercan - 1/24/2020
I build a list, like so:

<list category1>
/ items = ("01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16")
/ replace = false
</list>

<list category2>
/ items = ("17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32")
/ replace = false
</list>

<list catalogue>
</list>

<values listbuilder>
/ delaytype = -1
/ ct = 0
/ ct2 = 0
/ tester = "..."
</values>

<block listbuilder>
/ trials = [1=listbuilder]
</block>

<trial listbuilder>
/ ontrialbegin = [
    values.delaytype+=1;
    values.ct+=1;
    if(values.delaytype==4){
        values.delaytype=0;
        list.catalogue.appenditem(concat(concat(values.delaytype,"F"),list.category1.nextvalue));
        list.catalogue.appenditem(concat(concat(values.delaytype,"O"),list.category2.nextvalue))
    }else{
        list.catalogue.appenditem(concat(concat(values.delaytype,"F"),list.category1.currentvalue));
        list.catalogue.appenditem(concat(concat(values.delaytype,"O"),list.category2.currentvalue));
    }
]
/ timeout=0
/ branch=[
    if(values.ct < 16*4){
        trial.listbuilder
    }
]
</trial>


However, any subsequent call to list.catalogue.nextvalue causes an error and does not provide the next value. It says:

element: list.catalogue
attribute: nextvalue
message: Expression '2F10' is invalid. Expression contains an unknown element or property name.



It seems like Inquisit is trying to parse the list item... but I merely want to assign the item as a string to a variable. What should I do?

The problem is the mixing of different data types -- integers (values.delaytype) and string literals "O" and "F". Due to the order of operations in your nested concat() statements, the resulting value will attempt to be interpreted as a numerical value, which it actually isn't. The solution is to effectively cast the value to a string data type by enclosing it in quotes.

I've separated it into steps below for clarity:

<list category1>
/ items = ("01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16")
/ replace = false
</list>

<list category2>
/ items = ("17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32")
/ replace = false
</list>

<list catalogue>
</list>

<values listbuilder>
/ delaytype = -1
/ ct = 0
/ ct2 = 0
/ item = ""
/ tester = "..."
</values>

<block listbuilder>
/ trials = [1=listbuilder; 2-129=mytrial]
</block>

<trial listbuilder>
/ ontrialbegin = [
  values.delaytype+=1;
  values.ct+=1;
  if(values.delaytype==4){
   values.delaytype=0;
        values.item = concat(concat(values.delaytype,"F"),list.category1.nextvalue);
        values.item = concat(concat("~"", values.item), "~"");
   list.catalogue.appenditem(values.item);
        values.item = concat(concat(values.delaytype,"O"),list.category2.nextvalue);
        values.item = concat(concat("~"", values.item), "~"");
   list.catalogue.appenditem(values.item);
  }else{
        values.item = concat(concat(values.delaytype,"F"),list.category1.currentvalue);
        values.item = concat(concat("~"", values.item), "~"");
   list.catalogue.appenditem(values.item);
        values.item = concat(concat(values.delaytype,"O"),list.category2.currentvalue);
        values.item = concat(concat("~"", values.item), "~"");
   list.catalogue.appenditem(values.item);
  }
]
/ timeout=0
/ branch=[
  if(values.ct < 16*4){
   trial.listbuilder
  }
]
</trial>

<trial mytrial>
/ ontrialbegin = [
    values.item = "";
    values.item = list.catalogue.nextvalue;
]
/ stimulusframes = [1=mytext]
/ validresponse = (57)
</trial>

<text mytext>
/ items = ("<%values.item%>")
</text>



Sercan
Sercan
Partner Member (540 reputation)Partner Member (540 reputation)Partner Member (540 reputation)Partner Member (540 reputation)Partner Member (540 reputation)Partner Member (540 reputation)Partner Member (540 reputation)Partner Member (540 reputation)Partner Member (540 reputation)
Group: Forum Members
Posts: 10, Visits: 44
Dave - 1/24/2020
Sercan - 1/24/2020
I build a list, like so:

<list category1>
/ items = ("01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16")
/ replace = false
</list>

<list category2>
/ items = ("17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32")
/ replace = false
</list>

<list catalogue>
</list>

<values listbuilder>
/ delaytype = -1
/ ct = 0
/ ct2 = 0
/ tester = "..."
</values>

<block listbuilder>
/ trials = [1=listbuilder]
</block>

<trial listbuilder>
/ ontrialbegin = [
    values.delaytype+=1;
    values.ct+=1;
    if(values.delaytype==4){
        values.delaytype=0;
        list.catalogue.appenditem(concat(concat(values.delaytype,"F"),list.category1.nextvalue));
        list.catalogue.appenditem(concat(concat(values.delaytype,"O"),list.category2.nextvalue))
    }else{
        list.catalogue.appenditem(concat(concat(values.delaytype,"F"),list.category1.currentvalue));
        list.catalogue.appenditem(concat(concat(values.delaytype,"O"),list.category2.currentvalue));
    }
]
/ timeout=0
/ branch=[
    if(values.ct < 16*4){
        trial.listbuilder
    }
]
</trial>


However, any subsequent call to list.catalogue.nextvalue causes an error and does not provide the next value. It says:

element: list.catalogue
attribute: nextvalue
message: Expression '2F10' is invalid. Expression contains an unknown element or property name.



It seems like Inquisit is trying to parse the list item... but I merely want to assign the item as a string to a variable. What should I do?

The problem is the mixing of different data types -- integers (values.delaytype) and string literals "O" and "F". Due to the order of operations in your nested concat() statements, the resulting value will attempt to be interpreted as a numerical value, which it actually isn't. The solution is to effectively cast the value to a string data type by enclosing it in quotes.

I've separated it into steps below for clarity:

<list category1>
/ items = ("01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12", "13", "14", "15", "16")
/ replace = false
</list>

<list category2>
/ items = ("17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32")
/ replace = false
</list>

<list catalogue>
</list>

<values listbuilder>
/ delaytype = -1
/ ct = 0
/ ct2 = 0
/ item = ""
/ tester = "..."
</values>

<block listbuilder>
/ trials = [1=listbuilder; 2-129=mytrial]
</block>

<trial listbuilder>
/ ontrialbegin = [
  values.delaytype+=1;
  values.ct+=1;
  if(values.delaytype==4){
   values.delaytype=0;
        values.item = concat(concat(values.delaytype,"F"),list.category1.nextvalue);
        values.item = concat(concat("~"", values.item), "~"");
   list.catalogue.appenditem(values.item);
        values.item = concat(concat(values.delaytype,"O"),list.category2.nextvalue);
        values.item = concat(concat("~"", values.item), "~"");
   list.catalogue.appenditem(values.item);
  }else{
        values.item = concat(concat(values.delaytype,"F"),list.category1.currentvalue);
        values.item = concat(concat("~"", values.item), "~"");
   list.catalogue.appenditem(values.item);
        values.item = concat(concat(values.delaytype,"O"),list.category2.currentvalue);
        values.item = concat(concat("~"", values.item), "~"");
   list.catalogue.appenditem(values.item);
  }
]
/ timeout=0
/ branch=[
  if(values.ct < 16*4){
   trial.listbuilder
  }
]
</trial>

<trial mytrial>
/ ontrialbegin = [
    values.item = "";
    values.item = list.catalogue.nextvalue;
]
/ stimulusframes = [1=mytext]
/ validresponse = (57)
</trial>

<text mytext>
/ items = ("<%values.item%>")
</text>



That worked. Thanks!
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