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First, this problem just started ever since I've been converting me EZ Scripts into JavaScripts in my project. I now have a mix of both scripts through out my project. These EZ Scripts worked before I started this process.
At some point during this process of conversion I started getting an error message from an EZ Script that uses math functions. Th error seems to center around the minus '-" function. I haven't stopped to test but it may extend to other math functions.
Below is the error I get in ARC:
> Error on line 70: Operator '-' invalid for strings.
Here is the ez sCRIPT COMMAND ON Line 70 from the script that runs. Like I mentioned above this used to work. There is no other script that depends on this script to run:
print("Received:" + ($Rt_Elbow_stopped-10))#Print Emergency Stop Position
I also get this error from other lines in this script using this function. Here's one:
ELSEif ($Lft_Elbow_stopped <($Lft_Elbow_Center-10) or $Rt_Elbow_stopped <($Rt_Elbow_Center-10))
Any ideas what is happening? Is my process of adding JS scripts to my project and mixing EZ Scripts with JS scripts somehow causing this? I didn't have this issue till I started adding JS Scripts.
The error says
So the content of the variable is a string. You can't subtract from a string. You'll have to check the content of the variable that you're subtracting from.
At some place in your program, you're assigning a string to one of those variables.
Ahh, I must have another script using that var. Thanks. I'll go hunting.
Thanks again @DJ. Turns out I had to change that string into a number. I found there are many ways to do this in JS. I ended up using the Number function. Here's the working script with the command line in Bold:
//Send Request to Kangaroo Channel 1 to Get Position of Right Elbow Motor var Get_Rt_Elbow_P = "1, Getp\r"; UART.hardwareUartWrite(0,Get_Rt_Elbow_P.length,2); //UART 0 on EZB 2 UART.hardwareUartWriteString(0,Get_Rt_Elbow_P,2); //UART 0 on EZB 2
//Pause to let UART Buffer fill sleep( 100 );
//Read Full String Actual Position of Right Elbow Motor. Expecting 1,pxxx (Lowercase p - Still Moving)) or 1,Pxxx(Upper case P - Movment Stopped) var UartReadStringAvailable_RtElbow = UART.hardwareUartReadStringAvailable(0,2); print("UartReadStringAvailable_RtElbow: " + UartReadStringAvailable_RtElbow);
//Read last numbers in returned string and turn string into numbers then set golbal var var Rt_Elbow_stopped = Number(UartReadStringAvailable_RtElbow.substr(3, 7)); print ("Rt_Elbow_stopped: " + Rt_Elbow_stopped); setVar( "$Rt_Elbow_stopped", Rt_Elbow_stopped );
//Set another golbal var var Rt_Elbow_Center = Rt_Elbow_stopped; print( "Rt_Elbow_Center: " + Rt_Elbow_Center ); setVar( "$Rt_Elbow_Center",Rt_Elbow_Center);
Oh nice! Glad you figured it out. Now we know about Number() function