# Re: PDF convolution not working out accurately

Thanks a lot Tristam!

I overlooked the fact that the normpdf argument takes std. dev as an
argument, and not variance.

That said, thanks a lot for clearing up the stuff on the convolution. So
essentially, if I am interested only in the convolution between min(x) and
max(x), there is no harm in clipping right?

As long as you are careful to not throw away any probability mass that
should be fine. Be careful to keep track of what your new limits become.

--
Dr Tristram J. Scott
Energy Consultant
.

## Relevant Pages

• Re: PDF convolution not working out accurately
... dev as an argument, and not variance. ... thanks a lot for clearing up the stuff on the convolution. ... So essentially, if I am interested only in the convolution between minand max, there is no harm in clipping right? ...
(comp.soft-sys.matlab)
• Re: Simple pulse stretcher
... On Mar 9, 10:06 pm, Phil Hobbs ... theorem that variances add under convolution, ... variance of this is proportional to the normalized second derivative at ... bandwidth of the beat note to measure the laser bandwidth.. ...
(sci.electronics.design)
• Re: Simple pulse stretcher
... evaluated at zero frequency. ... an odd function vanish at the origin, as do odd-order derivatives of an ... The first term is the variance of G, the second is the variance of H, ... trivial issue, variances add under convolution. ...
(sci.electronics.design)
• Re: Simple pulse stretcher
... theorem that variances add under convolution, ... evaluated at zero frequency. ... an odd function vanish at the origin, as do odd-order derivatives of an ... variance of this is proportional to the normalized second derivative at ...
(sci.electronics.design)
• Re: Simple pulse stretcher
... From the derivative theorem, the variance is proportional to the second derivative of the transform, evaluated at zero frequency. ... Even-order derivatives of an odd function vanish at the origin, as do odd-order derivatives of an even function. ... It is always possible to satisfy this condition by an appropriate choice of the time origin, so if you'll allow me to slide over that rather trivial issue, variances add under convolution. ...
(sci.electronics.design)