MATLAB: Summing vector of symbolic with symsum

symbolicSymbolic Math Toolboxsymsumvectors

how can i use symsum with symbolic vector?

w=sym('w',[12 1]);
syms k;
symsum(w(k),k,1,12)

Best Answer

Just remove your last two lines and replace with

sum(w)

Related Solutions

MATLAB: How to create an equation for symsum that involves multiplaction, fractions, etc

Hello,

You need a multiplication sign between 2 and k:

syms k 
f= 1/((2*k+1)^2.*(2*k+3)^2) 
S_symsum= symsum(f, k, 0, 499)

Hope this helps!

MATLAB: Hello, how to solve this equation EIk^4-mv^2k^2+2mvwk+(m+M)w^2=0 numerically where w is variable,

Supply all the scalar parameters, then:

Eqn = @(w) E*I*k^2-m*v^2*k^2+2*m*v*w*k+(m+M)w^2;
w0 = 42;
[w,fval] = fsolve(Eqn, w0)

Experiment with the correct value of ‘w0’ to get the correct result.

EDIT — (Dec 10 2019 at 13:18)

The Symbolic Math Toolbox produces:

w = (k*(- E*I*k^2*m - E*I*M*k^2 + 2*m^2*v^2 + M*m*v^2)^(1/2) - k*m*v)/(M + m)

or to calculate both roots:

w = [(k*(- E*I*k^2*m - E*I*M*k^2 + 2*m^2*v^2 + M*m*v^2)^(1/2) - k*m*v)/(M + m)
     -(k*(- E*I*k^2*m - E*I*M*k^2 + 2*m^2*v^2 + M*m*v^2)^(1/2) - k*m*v)/(M + m)]

Best Answer

Related Solutions

MATLAB: How to create an equation for symsum that involves multiplaction, fractions, etc

MATLAB: Hello, how to solve this equation E*I*k^4-m*​v^2*k^2+2*​m*v*w*k+(m​+M)w^2=0 numerically where w is variable,

Related Question

MATLAB: Hello, how to solve this equation EIk^4-mv^2k^2+2mvwk+(m+M)w^2=0 numerically where w is variable,