( September 2015) ( Learn how and when to remove this template message) Statements consisting only of original research should be removed. Please improve it by verifying the claims made and adding inline citations. This section possibly contains original research. Hence part of the art of using IDL (or any other array programming language, for that matter) for numerically heavy computations is to make use of the built-in vector operations. The NaN is excluded from the visualization generated by the plot command.Īs with most other array programming languages, IDL is very fast at doing vector operations (sometimes as fast as a well-coded custom loop in Fortran or C) but quite slow if elements need processing individually. This example contains a division by zero IDL will report an arithmetic overflow, and store a NaN value in the corresponding element of the y array (the first one), but the other array elements will be finite. Note that the operation in the second line applies in a vectorized manner to the whole 100-element array created in the first line, analogous to the way general-purpose array programming languages (such as APL, J or K) would do it. ENVI 5.6 + IDL 8.The findgen function in the above example returns a one-dimensional array of floating point numbers, with values equal to a series of integers starting at 0.Instructions for installing and licensing ENVIįirst please login with your HUID/HarvardKey here: Software Access, to get credentials for the Download Links below.ENVI 5.6.1 + IDL 8.8.1 for Microsoft Windows.This software is available to Harvard Affiliates only.ĭownload latest version (Harvard ID required): When you are not actively using the software, please exit it promptly, to free up the license for other users.
The total number of ENVI+IDL licenses shared by all Harvard users is very limited. Please do NOT use it for IDL only if your program does not involve the usage of ENVI. Note: CGA’s IDL licenses are solely for supporting ENVI users.
IDL is the trusted scientific programming language used across disciplines to extract meaningful visualizations out of complex numerical data. All ENVI products integrate with ArcGIS® from Esri, are easily customized to meet your unique needs, and are backed by a robust community of users that crosses disciplines. They are designed to be used by everyone from GIS professionals to image analysts and image scientists, regardless of prior experience with imagery. ENVI products create the premier geospatial software foundation to process and analyze all types of imagery and data such as multispectral, hyperspectral, LiDAR, and SAR.
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