TMS320F2800137: A float array can't Graph properly

Part Number: TMS320F2800137

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Hi, I want to monitor the variable 'electronic angle'. I assigned it to an array, but I can't plot it. It prompts that only integer variables can be used this way. The 'electronic angle' is of float type, but it displays fine in the documentation. How should I do this? A float array can't display properly, but a single variable works.