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Symbol Table Help!


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    Sabrina Pearson

    Hi emagee,

    The symbol table is designed to be a unique symbol for each point in the graph, but the symbol is not related to the data. So, there is no way to link the symbol with the detect/non-detect status using a symbol table. Instead, I would recommend using one of the two methods below.

    Symbol column:

    1. In the symbol column, you would have the actual symbol number you want to use for each point. So, you would create a new worksheet column in your original data file. If the data point on the first row is a detect, put the symbol number for detect. If the data point on the first row is non-detect, put the symbol number for non-detect. Repeat the process for every row in the data file. The symbol number is shown next to a symbol in Grapher. So, if you are using "GSI Default Symbols", the symbol number for the closed circle is 12 and the open circle is 11, for instance.
    2. Once you have the column, click on the Line/Scatter Plot.
    3. In the Properties window, click on the Symbol tab.
    4. Change the Symbol column to the new column.

    Classed scatter plot:

    The classed scatter plot is similar to the symbol column idea. But, the data is split into classes based on some column in your worksheet. So, if your data has some value that indicates whether it is a detect or non-detect, you can use this method.

    1. Click the Graph | 2D XY Graphs | Class Scatter command.
    2. Select the data file and click Open.
    3. Click on the class scatter plot to select it and make sure the Class column is the column that has the numeric detector value.
    4. You can then change the number of classes and the symbol for each class by clicking the Classes option.



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