hey guys i'm currently working on a simple max script tool for my scripting class, and i 've ran into a problem.

i'm trying to run this command:
"render outputSize: [xWidth,xHeight]"
as you can see in the code below it takes the values inputted be the spinner and does a simple math formula. Then it should render ...but it doesn't
currently on the "25% Button" has the render code in it.

you can download the file from here:
http://www.filedropper.com/hitenmistry1




"/*
Mistry

Render Tools
This tool lets the user choice from 4 different render percents and can manully input the
width and height of the render directly into the dialog


*/
-------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------
try(destroyDialog myToolUIR)catch()
rollout myToolUIR "RenderTools"
(

group "Size"
(

--renderWidth
spinner myrenderWidth "Width"

--renderHeight
spinner myrenderHeight "Height"

)

group "Render"
(
--25%
button my25Bt "25%"

--50%
button my50Bt "50%"

--75%
button my75Bt "75%"

--100%
button my100Bt "100%"
)

group "Percent"
(
--Percent
spinner myPercentSp "Percent:" feildWidth: 100 \
type:#integer range: [5,100,5]
)

--25% Button
on my25Bt pressed do
(
--Converts spinner values
.25 * myrenderWidth.value= xWidth
.25 * myrenderHeight.value= xHeight
render outputSize: [xWidth,xHeight]
--outputwidth: xWidth
--outputheight: xHeight
render()
)

--50% Button
on my50Bt pressed do
(

-- .50 * myrenderWidth= xWidth
-- .50 * myrenderHeight= xHeight
--outputwidth: <xWidth>
--outputheight: <xHeight>
--render()
)


--75% Button
on my75Bt pressed do
(

-- .75 * myrenderWidth= xWidth
-- .75 * myrenderHeight= xHeight
--outputwidth: <xWidth>
--outputheight: <xHeight>
--render()
)


--100% Button
on my100Bt pressed do
(

-- myrenderWidth= xWidth
-- myrenderHeight= xHeight
--outputwidth: <xWidth>
--outputheight: <xHeight>
--render()
)


--outputwidth: <number>
--outputheight: <number>

--render
--render()




)
createDialog myToolUIR

"

You have a number of issues:

1. First, it is 'fieldWidth', not 'feildWidth' (no excuse for that sort of thing!)
2. Second, there is a problem with your variable assignment. Every coding language I know of has the variable to the left, then the equal sign, then evaluates the right side. So ".25 * myrenderHeight.value= xHeight " should be "xHeight = .25 * myRenderHeight.value"
3. Third, you can get a 0 value for your render size, which will throw an error. Also remember that if you pass a float into a function that takes an integer (such as render()), floats ALWAYS round down to integers- so if the spinner value is 2, and you multiply it by .25, you're going to pass in a value of 0. Before calling render, therefore, you will want to check to make sure any fractional value below 1 should be set to 1.

Fourth, it is never too early to teach good code design:
You can simplify your entire script by placing this function below your rollout controls and above the event handlers:

fn doRender theScale =
(
	render outputSize:([myrenderWidth.value, myRenderHeight.value] * theScale)
)

And then all of your event handlers look like this:

on my25Bt pressed do
(
	doRender .25
)

etc.