Solving Integrals with MATLAB

I am stuck on one of the problems i am working on. Could anyone tell me how to write a code for this problem? Using the quadl and the int command.

Problem: f(x)=integral sign(1+5/1+x^2)dx

upper bound is 1

lower bound is 0

[madhan ravi]

What have we tried? Read the documentation of integral().

[Walter Roberson]

x^2 cannot be negative for real x, but could be 0.

Adding 1 and (5/1) to that gives you 6+x^2, and for real x that has a mininum value of 6 -- always positive.

sign() of an always-positive value is always 1.

Therefore you are taking the integral of the constant 1 over a range. The indefinite integral of that is x, so the definite integral is (upperbound minus lowerbound), 1 - 0, for a total of 1.

Therefore the value of your integral is 1.

[David Wilson]

I interpreted it as "integral_sign", not integral ( sgn(...) dx).

[KALYAN ACHARJYA]

Read the Walter comment and clarify on (1+5/1+x^2)??

For integral, look here, still unsolved let us know?