EDIT menu

  •   CHANGE OR REMOVE      This selection is a submenu with three items:

  •   CHANGE BLOCK     This option allows you to replace the values within a selected block with a user-defined constant.  Optionally, you can do this to multiple blocks simultaneously.  This is useful in many situations.  One example is if you wish to apply the 'minimum value' analysis operation, but your data contains some reference readings.  By marking the references and then changing them to some arbitrary large value, you can scan the complete data set and the analysis will be restricted to 'real' data instead of being confused by reference points.

  •   REMOVE BLOCK     This option removes the data within a marked block, either within a single channel or for all the channels (the 'entire file' option).  In either case, the elapsed time and time-of-day readouts in the data bar are no longer accurate for data points later in the file than the removed segment.   The one exception to this rule is if you deleted a block at the beginning of the file (i.e., starting at the first case).

  •    REMOVE CHANNEL   K     This option removes one or more entire channels from the file.  At least one channel must remain.  The 'undo' option cannot restore a channel or channels after they are removed from the file.

  •   CROP FILE TO BLOCK...     If you have a selected block, this option will delete all of the cases outside of the block (like 'cropping' a photograph).   The crop is applied to all channels, and cannot be 'undone' (however, it does warn you of this risk).   After the crop, the time indicators remain accurate but in some circumstances (drastic crops of long-duration files) the date indication may be incorrect (you might lose a day; this can be fixed in the EDIT FILE DATA option).

  •    DUPLICATE CHANNEL     Makes an identical copy of the currently active channel, and makes the new copy the active channel (this only works if the number of channels is less than 24).

  •    RE-ARRANGE CHANNELS      This window lets you shift the order of the channels in a file (it also allows channel duplication and channel deletion). The window shows the current channel order; you click channel-indicator buttons ('next...') in the order you desire the new arrangement to be.   This image shows channel order selection in progress, with three channels chosen out of six:


    A check-button lets you opt to have a suffix indicating re-arrangement appended to the file name.
    NOTE:   This operation is not undo-able.

  •    RECORD EDITS      This option (on by default) records every action that changes a file's data in the file's comments, so they can be reviewed later.

  •    FIX ENDIAN BYTE ORDER      PowerPC and Intel processors store numeric data in different formats (most significant bit first or last).   If you try to read data obtained on a PPC on an Intel machine, the information will be wildly incorrect.   LabAnalyst usually finds and fixes any such problems transparently, but this option lets you perform the conversion manually.

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