How to increase a variable with plotscript?

[marionline]

Hi,
It feels a bit stupid to ask such a thing, but even thoug using the plotscript dictionary I fail to figure out how to increase a (global) variable.
The compiler tells me that + is not allwed inside a script, and suggested using add, but still the script is not acepted.


I placed the variable under the include part, I hope that's okay.

Code: Select all

global variable (1,stepcounter) 
...
plotscript,each step,begin
# global variable can be read and set in any script
stepcounter add 1 
show value (stepcounter)

end

Thanks for you help!

[BMR]

Code: Select all

plotscript, each step, begin

    stepcounter += 1

end

That's pretty much it I suppose. Alternatively:

Code: Select all

plotscript, each step, begin

    stepcounter := stepcounter + 1

end

[Bob the Hamster]

Hi,
The compiler tells me that + is not allwed inside a script, and suggested using add, but still the script is not acepted.

Can you send me a screenshot or a copy-paste of that error message? it sounds wrong.

[Gizmog]

I think when you use the add command, you're supposed to seperate it from the numbers involved with commas. Like, shouldn't it look like:

Code: Select all

stepcounter,add,1

[Bob the Hamster]

I... I don't even remember if Giz is correct.

I think nobody should ever be using the add command directly. Any error message that still recommends it is a bug.

[marionline]

That's the Error message I got:


I re-read it and i think it's not saying that I should use add instead of +, so the problem here were a missunderstanding. Still, I'm not sure what the compiler wants to tell me. Sorry.

I'll try out the other sugesstions on how to increase a variable and I'll tell you what worked and what not, maybe we could then add an example to the
plotscript dictionary or the wiki.

[TMC]

It's complaining that "stepcounter + 1" doesn't do anything. Yes, add two numbers together, and then what? The result of the addition is thrown away.

Yes, Giz is right. And trivia: if you don't include plotscr.hsd then you should instead write "add(a, b)"

[marionline]

@TMC: Now it makes sense. Thanks!

BMR's version works.
Giz's version seems not to work, the compiler says that 0 arguments are passed to math function add, but it should be always two.

Thanks!

[TMC]

Oh whoops, Giz and I were wrong. I'm thinking of the mod command which has a different form when plotscr.hsd isn't included.