syntax error

I am trying to run a simulink block diagram simulation. I have the following function in a func block: (-1/(J/(X^2)+m))*(m*g*sin(u(3))-m*u(1)*(u(4))^2)

no matter what I do I continue to get a sytax error and I simply cannot see what the problem is. Can someone please take a look at this and tell me I am blind.

Answer 1

[Jarrod Rivituso]

There doesn't seem to be anything wrong just based on your syntax.

However, some things to think about...

1. Are all the parameters defined in your workspace? It seems as though you've used an uppercase X and J, so be careful there.
2. Is the input signal to the function block a vector with at least 4 elements? You can select Format -> Port/Signal Displays -> Signal Dimensions to see this.

Good luck.

[Jason]

Thanks Jarrod. The X was a entered as a lower case x in the command window. I figured it would be something simple.

Answer 2

[ningsih]

X = '('mon';'tues'; 'wed';'thurs';'fri';'sat';'sun')';