[ztdep]

YY
{
		type exprField;
        libs    (fieldFunctionObjects);
		dimensions [0 0 0 0 0 0 0];
		field YY;
		expression "(mag(pos().y())<=1) ? pos().y()/0.00546 : (2.0-pos().y())/0.00546";	
}

I use expreField fo to generate a new field "YY", but it feeds back the error info of

  Different dimensions for '(a - b)'
     dimensions : [0 0 0 0 0 0 0] != [0 1 0 0 0 0 0]

I know the source is "(2.0-pos().y())" , but how to give 2.0 a unit or how to make pos.y() dimensionless.
Regards

[dlahaye]

Not sure.

Replace

YY
{
		type exprField;
        libs    (fieldFunctionObjects);
		dimensions [0 0 0 0 0 0 0];
		field YY;
		expression "(mag(pos().y())<=1) ? pos().y()/0.00546 : (2.0-pos().y())/0.00546";	
}

by

YY
{
		type exprField;
        libs    (fieldFunctionObjects);
		dimensions [0 1 0 0 0 0 0];
		field YY;
		expression "(mag(pos().y())<=1) ? pos().y()/0.00546 : (2.0-pos().y())/0.00546";	
}

?

[ztdep]

Originally Posted by dlahaye

Not sure.

Replace

YY
{
		type exprField;
        libs    (fieldFunctionObjects);
		dimensions [0 0 0 0 0 0 0];
		field YY;
		expression "(mag(pos().y())<=1) ? pos().y()/0.00546 : (2.0-pos().y())/0.00546";	
}

by

YY
{
		type exprField;
        libs    (fieldFunctionObjects);
		dimensions [0 1 0 0 0 0 0];
		field YY;
		expression "(mag(pos().y())<=1) ? pos().y()/0.00546 : (2.0-pos().y())/0.00546";	
}

?

Thanks ,but it doesn't work, still gives the same error.
the problem is the dimension of the number "2.0" is diffreent from pos().y() .

[dlahaye]

Not sure.

Replace y() by y.value() ?

[ztdep]

Originally Posted by dlahaye

Not sure.

Replace y() by y.value() ?

Unknown method: value in expression at position:51
<<<<
(pos().y()<=1) ? pos().y()/0.00546 : (2.0-pos().y().value())/0.00546
^^^^ near here