You are given x$,$y marker data for the knee, ankle, and toe. Positions are in meters, and the origin of the coordinate system if the

global lab system.

$-$ knee $=[0\mathrm{.}172,0\mathrm{.}432]$

$-$ ankle $=[-0\mathrm{.}128,0\mathrm{.}249]$

$-$ toe $=[-0\mathrm{.}081,0\mathrm{.}051]$

Calculate the ankle angle following the convention shown in the figure below.

What is wrong with my code?

$\%\%$ To calculate the ankle angle using the convention shown in the figure above, the foot and shank segment angles need to be calculated.

$\%$ Create a variable named knee$\_($x$)$y and assign the x$-$value for the knee to the first element of a row vector and the y$-$value of the knee to the second element of the vector.

knee$\_($x$)$y $=[0\mathrm{.}172,0\mathrm{.}432]$;

$\%$ Create a variable named ankle$\_($x$)$y and assign the x$-$value for the ankle to the first element of a row vector and the y$-$value of the ankle to the second element of the vector.

ankle$\_($x$)$y $=[-0\mathrm{.}128,0\mathrm{.}249]$;

$\%$ Create a variable named toe$\_($x$)$y and assign the x$-$value for the toe to the first element of a row vector and the y$-$value of the toe to the second element of the vector.

toe$\_($x$)$y $=[-0\mathrm{.}081,0\mathrm{.}051]$;

$\%$ Calculate the shank segment angle in degrees and assign to variable shank$\_($a$)$ngle

shank$\_($a$)$ngle $=$ atan$2$d$($ankle$\_($x$)$y$(2)-$ knee$\_($x$)$y$(2),$ ankle$\_($x$)$y$(1)-$ knee$\_($x$)$y$(1))$;

$\%$ Calculate the foot segment angle in degrees and assign to variable foot$\_($a$)$ngle

foot$\_($a$)$ngle $=$ atan$2$d$($toe$\_($x$)$y$(2)-$ ankle$\_($x$)$y$(2),$ toe$\_($x$)$y$(1)-$ ankle$\_($x$)$y$(1))$;

$\%$ Calculate the ankle angle in degrees and assign to variable ankle$\_($a$)$ngle

ankle$\_($a$)$ngle $=$ foot$\_($a$)$ngle $-$ shank$\_($a$)$ngle $+90$;