https://ni.lithium.com/t5/LabVIEW/Least-square-linear-phase-FIR-filter/m-p/31024#M20522 I need to geta second order derivative of an array based on 2 stage filtering with a least square linear phase FIR "differentiator " filter. Previously this was done using the matlab routine firls using the "differentiator" tag. Any ideas how this can be done in LabView?<BR /><BR />Thanks in advance. <BR /> Tue, 18 Dec 2001 11:03:48 GMT markgs 2001-12-18T11:03:48Z https://ni.lithium.com/t5/LabVIEW/Least-square-linear-phase-FIR-filter/m-p/31024#M20522 I need to geta second order derivative of an array based on 2 stage filtering with a least square linear phase FIR "differentiator " filter. Previously this was done using the matlab routine firls using the "differentiator" tag. Any ideas how this can be done in LabView?<BR /><BR />Thanks in advance. <BR /> Tue, 18 Dec 2001 11:03:48 GMT https://ni.lithium.com/t5/LabVIEW/Least-square-linear-phase-FIR-filter/m-p/31024#M20522 markgs 2001-12-18T11:03:48Z https://ni.lithium.com/t5/LabVIEW/Least-square-linear-phase-FIR-filter/m-p/31025#M20523 I don't believe that LabVIEW has any differentiation functions that use this algorithm. The only derivative function is located in the analyze, signal processing, time domain. You would probably have to build your own. <BR /> Wed, 19 Dec 2001 20:01:35 GMT https://ni.lithium.com/t5/LabVIEW/Least-square-linear-phase-FIR-filter/m-p/31025#M20523 codeman2 2001-12-19T20:01:35Z