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一个布尔值的序列，怎么找到第一个true所在位置

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一个布尔值的序列，怎么找到第一个true所在位置

请教一下，这样一个布尔值的序列，要找到第一个的true所在的位置，在DolphinDB中有什么现成的函数吗？
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可以使用find函数来实现

find(x, true)

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