Does anybody knows why I use the Graphical Modeler in QGIS 3.0, the 'Number' input parameter can not be used by algorithms, I have tried the algorithms of 'Buffer', 'create grid' and others, but they can not use the 'Number' parameter I create as the below picture: (I am not good at English, I hope I describe my question clearly)

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You have to use @thisisanumber as Distance value. Parameter name in Parameter Definition window can include spaces, but you shouldn't use those spaces in tool window.

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