Error 42s
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with Thomas Okken about the innards of Free42 and understand what is reported in register Y when INTEG is executed. Basically it is the absolute value of the mooege error 42 difference between the last two approximations to the integral. The algorithm is a brute
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force Romberg algorithm (i.e., the cycle of estimate-extrapolate-double the sample points-estimate, etc., until desired convergence) using the transformations to produce uneven error 42 smarty spacing of the sample points a la Kahan. But what does the value represent in the real calculator? I believe that the 42S uses a more subtle and sophisticated adaptive quadrature routine. I think
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Karl Schneider has written on this but I can't find the link. Grateful for insight. Les Re: 42S integration--what does the "uncertainty" quantity really mean?Message #2 Posted by Karl Schneider on 19 Feb 2007, 3:10 p.m.,in response to message #1 by Les Wright
Hi, Les -- Quote: I think Karl Schneider has written on this but I can't find the link. Indded I have; here's a quote from my error 42 magicjack MoHPC Article #556: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=556 Quote: HP-42S: "The HP-42S utilizes the approach introduced in the HP-71B Math ROM, in which the user must enter the uncertainty of the integrand as a relative "accuracy" parameter. This value, entered as the variable "ACC" in the HP-42S, is a multiplicative tolerance. The "true" value of the integrand is taken to lie within a band whose width is +/- "ACC" times the calculated value of the integrand. Thus, the maximum estimated error of the calculated integral over the specified range will be "ACC" times the same integral of the absolute value of the integrand function over the same range. This approach has definite advantages: The bandwidth of uncertainty is smooth -- directly proportional to the value of the integrand. Any value of "ACC" may be specified, including those that correspond directly to the accuracy of an integrand that best fits measured data. This approach is practical on the HP-42S, because the required accuracy factor "ACC" is a named variable that need not be placed on the stack, and is difficult to overlook on the integration menu." Best regards, -- KS Re: 42S integration--what does the "uncertainty" quantity really mean?Message #3 Posted by Les Wright on 19 Feb 2007, 3:24 p.m.,in respoare young, aspiring engineers participating in First Tech Challenge, a robotics competition, and would love to have
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searchesMessagesNotification Back to home page |Listed in category: Consumer Electronics > Vintage Electronics > Vintage Calculators This Buy It Now listing has ended. Ships to: United States and many other countries | See details Import charges: $21.89 (estimated and based on current bid) To be provided at checkout help icon for Shipping - opens a layer This amount includes applicable customs duties, taxes, brokerage and other fees. This amount is subject to change until you make payment. For additional information, see the Global Shipping Program terms and conditions- opens in a new window or tab This amount includes applicable customs duties, taxes, brokerage and other fees. This amount is subject to change until you make payment. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. For additional information, see the Global Shipping Program terms and conditions- opens in a new window or tab No additional import charges on delivery Delivery: Estimated within 8-14 business days help icon for Estimated delivery date - opens a layer Estimated delivery dates - opens in a new window or tab include seller's handling time, origin ZIP Code, destination ZIP Code and time of acceptance and will depend on shipping service selected and receipt of cleared payment - opens in a new window or tab. Delivery times may vary, especially during peak periods. Includes international tracking Ships to: United States and many other countries | See details Details about HP 42S Scientific Calculator (USED Displays RAD FAIL 00020 error) | See original listing HP 42S Scientific Calculator (USED Displays RAD FAIL 00020 error) Photos not available for this variation Item condition: --not specified Ended: Dec 23, 2013 12:46:47 PST Price: US $80.00 Approximately 691.18 SEK(including shipping) Shipping: $26.16 (approx. 226.02 SEK) International Priority Shipping to Sweden via the Global Shipping Program help icon for Shipping - opens a layer This amount includes seller specified US shipping charges as well as applicable international shipping, handling, and other fees. This amount is subject to change until you make payment. For additional information, see the Global Shipping Program terms and conditions- opens in a new window or tab | See details Item location: Union City, California, United States Seller: daneastbay (406 ) | Seller's other items Description eBay item number:261360176186 Seller assumes all responsibility for this listing. Item specifics Brand: HP Model: 42S Size: Handheld Type: Scientific Key Size: R