About the continuous Fourier Transform

12142020, 06:02 AM
(This post was last modified: 12142020 11:20 AM by Stevetuc.)
Post: #21




RE: About the continuous Fourier Transform
(12132020 08:33 AM)Aries Wrote:(12102020 06:51 AM)dah145 Wrote: That'll be nice yeah. Thank you. Ive had a stab at translating this for the prime. Code:
The undefined symbol after e^( in the listing is the imaginary symbol i from the shift keyboard. Im getting an undefined result from the integration: Edit: I corrected a mistake in the code s*int(fff*ggg,x,a,bassumi)▶s should be s+int(fff*ggg,x,a,bassumi)▶s The result is now [x,0,±∞,±∞] in cas and [10.2581355196,0,+Inf,+Inf] in home Without the assume the result is 1 Needs more work! After clearing cas vars, I get this result: Code: ((−i)*e^(i*w*τ/2)+i*e^((−i)*w*τ/2))/w After applying exp2trig() Updated code with exp2trig included in returned value: Code: #cas 

12142020, 01:47 PM
Post: #22




RE: About the continuous Fourier Transform
A further reference for the nspire program with plots for common functions:
http://cb.mty.itesm.mx/ma3002/materiales...ierti.htm 

12152020, 01:47 AM
Post: #23




RE: About the continuous Fourier Transform
(12112020 03:37 PM)victorvbc Wrote:(12112020 12:42 AM)medwatt Wrote: What exactly does "classroom calculator" mean ? Does it mean you actually sit in a classroom while the teacher/lecturer is teaching and you use the calculator ? Or did you mean a portable calculator that you can use in a place like a library when you don't want to carry your laptop ? If you meant the former, then I just cannot imagine someone having time to focus on the lecture and then busy himself playing with their calculator. How does anyone have the time ? In fact, since I left school, I don't even take notes in class anymore. I just sit down, listen, jot down a few keywords, and that's it. I did a Control Engineering exam based on State Space approach and controller design and not even a pocket calculator was allowed. We had to invert and find the eigenvalues/vectors by hand. Granted, none of the matrices were more than 3x3, but what's the point of asking anyone to do a 4x4 matrix ? In fact, calculators are not allowed in most exams here (Germany). 

12152020, 02:46 AM
(This post was last modified: 12152020 03:09 AM by victorvbc.)
Post: #24




RE: About the continuous Fourier Transform
(12152020 01:47 AM)medwatt Wrote: I did a Control Engineering exam based on State Space approach and controller design and not even a pocket calculator was allowed. We had to invert and find the eigenvalues/vectors by hand. Granted, none of the matrices were more than 3x3, but what's the point of asking anyone to do a 4x4 matrix ? In fact, calculators are not allowed in most exams here (Germany). Some teachers don't allow these calculators here as well, especially because people can put pdfs in the calculators and cheat in the tests, but that's mostly on introductory subjects. In subjects like Calculus, Linear Algebra or Physics we aren't even allowed a pocket calculator either. But since I do a whole course based on controls, we see some advanced subjects in the last years, like system order reduction techniques, robust control, nonlinear control, robust stability analysis, etc. And those might require some computational power to be avaliable in the tests, if it's not just written theory questions. Also we have a specific teacher that likes to put high order systems in the problems just because, so his class essentially requires us to have a powerful calculator. The course has some spare HP 50g's to lend for students that can't afford one. I should've made it explicit that what I had said doesn't necessarily apply to all engineering courses here, but I'd say we don't have such a strict policy against calculators in general, too. 

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