Ease out function with trace path not working

Question

Hi there, I'm writing an expression that connects an objects scale to it's Trace Path progress value, so that as the object travels down a path, it scales up. But I don't want the scale to be linear, I want it to ease up in value as it completes the path. I wrote this expression for the scale property of the travelling object:a = effect("Trace Path")("Progress");
x = easeOut(a, 0, 100, 0.3, 100);

[x[0],x[0]]
But I keep getting the error: "Undefined value used in expression (could be an out of range array subscript?)" The error confuses me as I thought I had defined all variables needed for the expression. Any thoughts on what I'm missing?

Rick Gerard · Accepted Answer

You do not need the array in the last line:a = effect("Trace Path")("Progress");x = easeOut(a, 0, 100, 0.3, 100);[x, x];

Airweb_AE · Answer

x is a single value not an arrayI think the last line should be:[x, x]

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