Question from beginner - page 2
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To modify once per bar:
1. Make a global variable "int modified_this_bar = 0;".
2. Before modifying, always check that (modified_this_bar == 0)
3. When modification has been successful, "modified_this_bar = 1;"
4. When a new bar occurs "modified_this_bar = 0;"
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For #4:
1. Make a global variable called "int last_bar;"
2. "int last_bar = Time[0];" int your init() function for initialization simplicity (can be made better later on)
3. At every tick, if(last_bar != Time[0]), a new bar has appeared.
4. Update last_bar to Time[0] and "modified_this_bar = 0;"
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You should always make sure that your settings you're trying to modify have actually changed. No use issuing an order modification request if the variables remain the same.
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As for making it modify only at certain times inside a bar, you need to use a bit of simple math and https://docs.mql4.com/dateandtime depending on your timeframe.
I'll let you figure the time out, it should be straightforward after this.
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Jon