Call a function from inside a loop

[Alex100]

I'd like to call a function from inside a 'for' loop. I wrote the code below, but I get an 'undeclared identifier' error.

I tried lots of things to make it run, but couldn't find any solution.

Can someone please help me?

Alex

Code: Select all

//@version=5
indicator("My function")

my_function(i) =>
    // code here...
    [i]

for i = 1 to 10 by 1
    [result] = my_function(i)

plot (result)

[processingclouds]

Hey,

If you can complete your code a bit more, it would be easier to help you out in this.

Error "Undeclared Identifier" means you need to initialize the variable before you can use it.

[Alex100]

I already tried to declare the 'result' variable, but I still received an error.

If I declare it at the top of the script I get this error...

Shadowing variable 'result' which exists in parent scope.

and if I declare it right beneath the 'for' instruction, I get this one...

'result' is already defined.

I tried mostly everything I could think of, but nothing seemed to work.

Alex

[processingclouds]

When you declare the variable outside , and than want to use it again , you need to make sure you use

Code: Select all

:=

not just plain

Code: Select all

=

Code: Select all

float result = na

result = 1.0   // WRONG
result := 1.0  // CORRECT

[Alex100]

Ok, I no longer receive the two errors in my previous message, but a new one is showing up now, and I can't get rid of it:

line 11: Syntax error

I don't see any syntax error on line 11 (which is 'result := 1.0'), so what am I doing wrong? The code is this:

Code: Select all

//@version=5
indicator("My function")

float result = na

my_function(i) =>
    // code here...
    [i]

for i = 1 to 10 by 1
    result := 1.0
    [result] = my_function(i)

plot (result)

[processingclouds]

Do you have more code, so i can better understand exactly what you are trying to do ? It is not clear , whether you are creating arrays, or how your my_function works.... rather than // code here, if you can provide more code and explain what you intend it to do. Even if it has errors, i will atleast be able to understand the logic.

[Alex100]

Since I first posted my initial question, I did find a better solution that I used to replace this function, so I no longer have any code for it.

But to give you a basic example, the function can calculate the percentage of a number from another number. And in case you need something like this in multiple locations within a script (including a 'for' loop), you can simply call the function instead of writing the same code multiple times.

I'm not trying to create any arrays, I just need the basic functionality of any function: access the same code from multiple locations within a script.

[processingclouds]

Ok, so you are looking for a way to have a global variable that can be changed by a function. Here is a small indicator to show this :

Code: Select all

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// © processingclouds


//@version=5
indicator("My function", overlay=true)

result = array.new_float(1, 0.0)


my_function(i) =>
    oldValue = array.get(result, 0)
    array.set(result,0, oldValue + i)

for i = 1 to 10 by 1
    my_function(i*1.1)

if barstate.islast
    label.new(bar_index, high, str.tostring(array.get(result,0)), textcolor=color.white)

[Alex100]

Works great, thank you very much!