When you left-click on a point on a plot, ScopeFIR shows you information about the nearest data point. ScopeFIR uses a minimum-distance algorithm to determine which pixel you are pointing to when you click the mouse. Try to click the mouse as close a possible to the pixel you wish to examine. Important: On line plots, it is very important that you click near the top of the line, because if you click near the bottom of the line, the top of a nearby smaller line might be closer to the mouse pointer, and you may accidentally select the wrong line.

When you click on a point to show the bin and pixel information, a vertical cursor is drawn. To remove the cursor, click on any area outside the axes of the plot.

Frequency Response Plots

For Frequency Response plots, left-clicking the mouse shows the frequency value and the frequency response values of the nearest point.

Impulse Response Plots

To understand using the mouse in Impulse Response Plots, you must first understand pixelization. If the plot shows fewer data points than the number of horizontal pixels, ScopeFIR will plot each data point in a separate pixel, but if there are more data points than pixels, ScopeFIR must combine multiple data points into a single pixel. "Pixelization" is defined as the process of somehow combining multiple data points into a single plotting pixel when there are more data points to plot than there are pixels across the screen. When data points are combined into a pixel, the data point in the set which has the maximum magnitude is plotted. (You may control pixelization to some extent using the integer point reduction plot option.)

For Impulse Response plots, when you click on a plot point using the left button but do not significantly move the mouse, you will see information in the status window that describes the plot pixel, including its X-value, Y-value(s), X-width and the maximum bin represented by the pixel. When you left-click a second time, you will see a description of the maximum bin, in terms of its inphase and quadrature components, and its magnitude and phase.