[R] draw path diagram using dot

[eshi]

I did a simple path analysis and tried to draw the path diagram. I used
'path.diagram' in sem package and produced a graph using dotty in graphviz;
however, I don't know how to produce a graph from R directly. In the sem
package manual John mentioned that "to obtain graphics output directly, the
dot program must be on the system search path". Does anyone know how to set
it up?

Thank you very much!
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