Write a function nice_number, which has no argument, but asks the user to input on the keyboard a positive number. if the input of the user contains any symbol other than digits , the function should return a string "invalid input." otherwise, if the sum of the digits entered is a prime number the function should return the string "this is a nice number, you." in all other cases, the function should return "."

Using least squares fitting, you are to fit the data sets to the following models and solve for the parameters ai , where i is the index of the parameter. the input/output data for the systems are linked in the bblearn site. for each of the systems use matlab to plot the supplied data vs. the model fit on one plot. include your code in the solutions. (a) linear fit "lineardata.mat" y=a1x^3 + a2x^2 + a3x + a4 (b) plant fit "plantdata.mat g(s) = a1/(s + a2)

Which action is good business etiquette? a. switching your cell phone off before you enter a meeting b. keeping your cell phone on low volume before you enter a meeting c. setting a pleasant ring tone on your cell phone before you enter a meeting d. setting a standard ringtone on your cell phone before you enter a meeting

How are stop motion special effects in animated films created