# More musings on the HP 41CL

I go on playing with my HP 41cl. I was today making use of the different functions of the Sandmath module. (For the time being, I have entered the advantage PAC and the Sandmath module only. I have been using the advantage PAC for a long time and I know what’s in it; but the Sandmath is completely new for me)
In my ignorance, and having entered the latest Sandmath version, I did not read that I needed to install first the Library #4. That took me some time to find out. Once I sorted it out, I started using the number theory functions.
My elder son (9) is now learning how to factor a number in prime factors. It was nice to teach him the PRIME? and PFCT functions, so he sees that calcs have other uses apart from mere number crunching. He wanted to take it to class! He will be able to do the minimum common multiple and maximum common divisor too- that’s for next term though.
I have not made a speed comparison between the HP 15c and the HP 41cl. I will probably do it this week end (I have already ported all my 15c programs to the 41cl. I was able to make some improvements, using the additional functions of the ’cl). The more time consuming is my implementation of the IRR, using the advantage pac’s SOLVE function. For a 10 year calculation, it was taking a couple of minutes with the original calculator, and 5-10 seconds with the new one. Let’s see.
(For the to-do list: I want to browse through the multiple modules, to see which programs may be of use for me or my son. Incidentally, I will be reminded of how the world has progressed since the 41c launch.for example,the astro module tells the situation of a number of astronomy objects; same tasks can be achieved with one of the multiple apps for iPad, in graphical form, faster and more conveniently. Sorry for the digression)

I go on playing with my HP 41cl. I was today making use of the different functions of the Sandmath module. (For the time being, I have entered the advantage PAC and the Sandmath module only. I have been using the advantage PAC for a long time and I know what’s in it; but the Sandmath is completely new for me)

In my ignorance, and having entered the latest Sandmath version, I did not read that I needed to install first the Library #4. That took me some time to find out. Once I sorted it out, I started using the number theory functions.

My elder son (9) is now learning how to factor a number in prime factors. It was nice to teach him the PRIME? and PFCT functions, so he sees that calcs have other uses apart from mere number crunching. He wanted to take it to class! He will be able to do the minimum common multiple and maximum common divisor too- that’s for next term though.

I have not made a speed comparison between the HP 15c and the HP 41cl. I will probably do it this week end (I have already ported all my 15c programs to the 41cl. I was able to make some improvements, using the additional functions of the ’cl). The more time consuming is my implementation of the IRR, using the advantage pac’s SOLVE function. For a 10 year calculation, it was taking a couple of minutes with the original calculator, and 5-10 seconds with the new one. Let’s see.

(For the to-do list: I want to browse through the multiple modules, to see which programs may be of use for me or my son. Incidentally, I will be reminded of how the world has progressed since the 41c launch.for example,the astro module tells the situation of a number of astronomy objects; same tasks can be achieved with one of the multiple apps for iPad, in graphical form, faster and more conveniently. Sorry for the digression)

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