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## Solving for variable in piecewise integral  3-Visitor

## Solving for variable in piecewise integral

Hi All,

Relatively new to MathCAD, so apologies if there is an easy fix here.

I've prepared a calculation file that take some various data and creates a piecewise function using if statements.

The clip below shows a graph of the piecewise function, and the equation I am trying to solve. M(9.575 ft) = 0.967 lbf is confirmation that the function M(d) is working properly.  I am looking to try to solve for a value of d that will provide M(d)=0.  I am getting a "Pattern Match Error" with the equation I used above.

I'm wondering if it would be helpful to solve this equation within a range, but I've hit a dead end on figuring out how to approach that.

Any help is greatly appreciated.

Thanks

1 ACCEPTED SOLUTION

Accepted Solutions  23-Emerald III
(To:GH_10342329)

the solve and the right arrow are constructs that work for symbolics. You don't have that, You simply have a function M(d) where you want to find the value of d such that M(d) equals zero.

That can be simply accomplished using the root() function.

Assign a guess value to d, then call the root function. Like this:

d:= 9*ft

dzero:= root(M(d),d)

Now you can check if dzero results in an M-value of (near) zero, e.g. with:

M(dzero)=

The result should be very small.

Success!
Luc

2 REPLIES 2  23-Emerald III
(To:GH_10342329)

the solve and the right arrow are constructs that work for symbolics. You don't have that, You simply have a function M(d) where you want to find the value of d such that M(d) equals zero.

That can be simply accomplished using the root() function.

Assign a guess value to d, then call the root function. Like this:

d:= 9*ft

dzero:= root(M(d),d)

Now you can check if dzero results in an M-value of (near) zero, e.g. with:

M(dzero)=

The result should be very small.

Success!
Luc  3-Visitor
(To:LucMeekes)

Worked perfectly, thank youA 