In science and engineering, a semi-log plot / graph or semi-logarithmic plot / graph has one axis on a logarithmic scale, the other on a linear scale. It is useful for data with exponential relationships, where one variable covers a large range of values.
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Logs are helpful when plotting certain types of data. There are two types of log graphs that can be used when plotting data. The first is called a semi-log graph. In a semi-log graph the y-axis is logarithmic, which means the separation between the ticks on the graph is proportional to the logarithm of numbers.