In such cases point number position has no real world meaning. An example of this situation is looking for intensity at specific peak/trough wavelength values in an absorption spectrum or a particular shift in Raman spectrum. In many case, however, we need to access data in one wave that correspond to a particular value of calibration in another wave. It is best to take a custom of addressing waves by point number reference whenever possible - always use, unless you have specific reason to use scaled calibration. This means that in most cases booth methods will yeild the same result. Default scaled calibration starts with zero and increments by one from point to point. Practically we rarely use scaled calibration in this group. To specify position by scaled calibration incude numbers in round brakets: MyWave(5) or MyWave(5,10).To specify position by point number incude that number in square brackets: MyWave or MyWave.See Calibrations for details on types of calibrations used below.Ī particular point or a range of points within a wave can be addressed by either their position in a sequence or by scaled value: How this is done depends on whether you are reading or writing a value and how do you specify the position(s).Īddressing by position, scaled or calibrated value: In many cases we need to access a particuar point or subrange of points within a wave. If waves are of different size, the smallest size will be copied entirely. Where every point from wave MyData is copied to MyResult if waves have the same size (number of points). See matrices for more details.Įntire array of data in a wave can be addressed and manipulated as one object by using wave name, such as: Matrix can be visualized as a grid of numbers. When several sequences of values are combined together they make a two-dimensional wave, or a matrix. Simple wave above is a one-dimensional wave (linear). Notation MyExperiment means that you need a value at 4th position in wave called MyExperiment. This means that for a wave containing 100 values, index can vary form 0 to 99. Indexing in Igor starts from 0, not from 1 as we normally count.

To access specific value you need to indicate the name (nickname) of the wave and which number in the sequence you need.

It can be visualized as one column in a spreadsheet. For our convenience waves are given nicknames in human language.Ī simple wave is a single string (or array) of numbers. Wave are collections of number that can be manipulated as a group - all numbers at once. Waves are Igor objects you are most likely to work with. For more details see Waveform model of data, Igor 5 Manual, volume II, p.

Igor pro 7