各函数库中的函数可用hep函数库名 查询,或tpe函数名方法查询 例: help plotxy Two dimensional graphics Elementary X-Y graphs plot- Linear plot loglog -Log-log scale plot semilogx-Semi-log scale plot semilog- Semi-log scale plot fill Draw filled 2-D polygons各函数库中的函数可用help 函数库名 查询，或type 函数名方法查询 例：help plotxy Two dimensional graphics. Elementary X-Y graphs. plot - Linear plot. loglog - Log-log scale plot. semilogx - Semi-log scale plot. semilogy - Semi-log scale plot. fill - Draw filled 2-D polygons