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@mouhadz44,
You can iterate through the string and use JavaScript chartAt method to find the character at a given index. You can parse it to float / integer, before passing it to datapoint y-value.
If you are still facing the issue, kindly create JSFiddle reproducing the issue you are facing along with sample data and share it with us so that we can look into the code / chart-options being used, run it at our end to understand the use-case better and help you out.
—- Manoj Mohan Team CanvasJS