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Tutor profile: Jose R.

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Jose R.
University Professor with 25 years of experience
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Questions

Subject: SQL Programming

TutorMe
Question:

Apply the TRANSLATION, CLEANUP and SQL steps for the design of the following sql query “Provide a list of all staff ids, staff first name, staff last name, and salaries from the staff table.”

Inactive
Jose R.
Answer:

TRANSLATION: SELECT FROM THE STAFF TABLE A LIST WITH THE IDENTIFIER OF EACH STAFF, THE FIRST NAME, LAST NAME AND SALARY. CLEANUP: SELECT STAFF IDENTIFIER STAFF, FIRST NAME, LAST NAME SALARY. SQL: Select StaffID,StfFirstName,StflastName,Salary from staff;

Subject: MATLAB

TutorMe
Question:

To make a function that allows to construct in a symbolic way the polynomial of interpolation of degree n by the method of lagrange

Inactive
Jose R.
Answer:

function a = polylagSym (xi, yi) % Input - xi is the vector of abscissa 1 x n % - yi is the vector of ordinates 1 x n % Output - a is the vector 1 x n, vector containing the coefficients of % Lagrange polynomial of degree N-1 % of the form a1x ^ (n-1) + a2X ^ (n-2) + .... + a (n-1) X + a (n); % INTERPOLATION "LAGRAGE POLYNOMY" n=length(xi); syms pn x=sym('x');% this function allows us to leave the variable 'x' as symbolic % and thus be able to work with it, without having to assign a value to it. for j=1:n product=1; for i=1:j-1 product=product*(x-xi(i)); % Calculation of the top 1 product of L end product2=1; for i=j+1:n product2=product2*(x-xi(i));% Calculation of the top 2 product of L end product3=1; for i=1:j-1 product3=product3*(xi(j)-xi(i)); % calculation of the lower product 1 of L end product4=1; for i=j+1:n product4=product4*(xi(j)-xi(i)); %calculation of the lower product 2 of L end % Calculation of lagrange polynomials L(j)=(product*product2)/(product3*product4); end %Calculation of the interpolating polynomial of lagrange pn=0; for j=1:n pn=pn+L(j)*yi(j); end pn = simple(pn);

Subject: Numerical Analysis

TutorMe
Question:

Can Adams variable step multistep methods be improved for the solution of ordinary differential equations?

Inactive
Jose R.
Answer:

Effectively, the time can be improved by the previous calculation of coefficients for quotient ratios of predetermined steps.

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