Recent content by krnhseya

My new attempt... i=1; new_x=[]; newnewx=[]; for r=0.5:0.01:4; new_x(i)=fsolve(@myfun,[0 r]); newnewx(i)=((r*pi)/4)*cos(pi*new_x(i)); i=i+1; end r=0.5:0.01:4; plot(r,newnewx) where the myfun is: function F=myfun(x) x=x(1); r=x(2); F(1)=x-((r/4)*sin(pi*x));

So 1 equation and 1 variable...Looks darn easy but I just can't figure this out and MATLAB examples that I can find (including built-in help) doesn't get me any more help...Anyone...?

I think I posted in a wrong forum...I wasn't sure which category I was supposed to post this under but here it goes... 1. Homework Statement Find x where r varies from 0 to 4. 2. Homework Equations x-(r/4)*sin(pi*x)=0 3. The Attempt at a Solution The problem that I ran into...

right u substitution...thanks!

Homework Statement Integrate Homework Equations integrating following equation about dx: (b1-(b1*x/L)+(b2*x/L))^2 The Attempt at a Solution I expanded all terms than integrated. I used integration by part to get it down to this but I am curious to see if there's better way to...

It's exactly the same except the pressure side and suction side reversed. I'd guess that the z direction has to change but then I am not so sure that first case is even right.

Homework Statement Find the direction of the force exerted by the fluid to the airfoil. Homework Equations N/A The Attempt at a Solution I think that's the forces direction (x is horizontal and z is vertical) for 2 cases. In case I am dealing with either the compressor or...

Homework Statement Find the tension of the rope. Theta is 45 degrees and A cannot support any moments. Homework Equations Drag=0.5*Cd*(U^2)*A*rho The Attempt at a Solution While everything is known, I am unsure of the setup. I initially thought: T*(cos(45deg))=Drag But it doesn't work if...

Additional question, When you integrate polynomials, you get the constant, which can be identified based on initial condition. If you know the value for this constant, how do you specify it in MATLAB? Thanks

Thank you. I've looked in help, been to mathworks, etc. I am guessing the derivative should be done as follows for y=5x+6: a=[5 6]; z=polyder(a) And I do understand it output coefficients in order from the lowest power to the highest. Thank you!

>> ver ------------------------------------------------------------------------------------- MATLAB Version 7.8.0.347 (R2009a) MATLAB License Number: 542093 Operating System: Microsoft Windows Vista Version 6.0 (Build 6002: Service Pack 2) Java VM Version: Java 1.6.0_04-b12 with Sun Microsystems...

i still get the same error and i am using 7.8.0 (R2009a). thanks!

syms doesn't work...here's what message i get: ? Undefined function or method 'syms' for input arguments of type 'char'.

Hello, First of all, I am not trying to "spam" subforums. I found out that my thread shouldn't be posted under homework. Anyways, here it is. Integration Let say there's a polynomial, 5x+6 and you want to integrate from 0 to 3 respect to x, how do you input in MATLAB? (I guess you can't...

what are you assumptions? that will tell you what delta U is equal to.