http://collab.mathsoft.com/read?126329,63e#126329>I am trying to do spectral integration for the spectrum with different wavelength interval.<<br> ==> that request as a single element is done
==> you must then source the other "unknown data set"
==> also source the function.
A new project should always have an abstract that can be diagrammatically represented in order to avoid misinterpretation and especially relax the confusion of the originator. This work sheet contains the ASTM G-173 solar irradiance from which the solar constant 1348 (a variable constant) does match the range in the literature. Read it the other way around, your 2nd short data set ... what is it ? can it be sourced ? Is it a home made conclusion ? Intuitively the sine function looks like a partial "year irradiance", and that one too must be sourced. As you can see there is plenty of help at your finger tip from the keyboard of many cllabs just waiting for your own steps of information.
jmG