Redefinition Warnings |
Mathcad warns you whenever an expression redefines an existing function, variable, unit, or matrix by flagging it with a wavy green underscore. You can change the default setting for warnings on the Warnings tab of the Tools > Preferences dialog.
In addition, Mathcad also warns you if a redefinition occurs within a collapsed area or a referenced worksheet.
Redefinition warnings can be turned on and off with the keystroke sequence [Ctrl][Shift]R.
The flagged expression overrides the definition of an existing function. When you redefine a function as a variable, its original definition as a function is no longer available in the worksheet and may result in errors if used after the redefinition.
Certain functions are not flagged if they are redefined: if, Find, Maximize, Minerr, Minimize, Odesolve, and Pdesolve. Additionally, the functions min, pF, and sec are also the names of built-in units; redefining one of these three functions is only reported as a unit redefinition.
The flagged expression overrides the definition of an existing unit. This applies to all units, regardless of the unit system in use. If no unit system is in use in the worksheet, redefining a built-in unit such as m (meters) is flagged, as built-in units are undefined.
min, pF, and sec are also the names of Mathcad functions. They are only flagged as unit redefinitions, and not as function redefinitions.
The flagged expression overrides the definition of a built-in constant. Mathcad's built-in constants are e, p, ∞, and %.
The flagged expression overrides the definition of one of Mathcad's built-in variables. Some built-in variables, such as ORIGIN, affect features from solve blocks to matrices to the writing of structured data files. Built-in variables should never be used for anything other than their intended purpose.
The following built-in variables are flagged if they are redefined:
in0−in9 |
The flagged expression overrides a function previously defined in your worksheet. When you redefine a function as a variable, its original definition as a function is no longer available in the worksheet.
When a matrix is redefined, complications may arise if the redefined matrix contains fewer rows and/or columns than the original. Because matrices are overwritten on an element-by-element basis, existing elements outside the range of the redefinition are not nullified and may cause problems in your worksheet.
Collapsed areas allow you to hide regions in your worksheet. However, because these regions are not visible within the worksheet, you may not be aware of a redefinition that may cause an error or incorrect result in your worksheet. Expanding the area displays the problem expression.
Regardless of the display settings for the collapsed area, the icon is visible when a collapsed area is flagged due to a redefinition.
Referenced worksheets allow you to include expressions from one worksheet within another, without retyping them. However, since these expressions are not visible within your worksheet, you may not be aware of their contents. Double-clicking on the reference opens the worksheet for editing.
Since the referenced worksheet and the worksheet containing the reference are two separate files, the problem expression may not be flagged when you attempt to find it. For this reason, you should be very careful to compare the contents of the two worksheets when tracking down a redefinition in a referenced file.