Plotting a function that is determined by a Solve block and find Max/Min values

[Einhorn]

Hello,

I would like to plot a function, f(t) in which I previously used a Solve block to find the max/min value for the function. Since I had to put in an intial guess for the function in my Solve block the plot won't plot unless I move it above the solve block. Two questions then...

1. Is there a better way to determine the max/min values for a continous function over a given domain? I am not really sure how to set up the Maximize function for a problem like this.

2. Is there a way to reset a variable to be undefined once you have set it?

See attached example with the questions highlighted in yellow.

Thanks,

Mike

[MikeArmstrong]

How about the attached for undefining the variable?

Mike

[Einhorn]

That is interesting...I would have thought that defining t as a global variable would have kept the solve block from working.

Any thoughts on using the Maximize function to find the local value for t where the function is a Max?

Thanks,

Mike

[MikeArmstrong]

I'm sure there is another way to undefine but cannot think at the moment.

There has been many worksheets past within the forum to find maximum and minimum values. Unfortunately I don't have time at the moment - try searching maxima or minima, you might find the sheets I am referring too.

If you don't find them I'll try and dig them out later.

Mike

[AlanStevens]

Michael Einhorn wrote:

Any thoughts on using the Maximize function to find the local value for t where the function is a Max?

Just put Maximize(P,t) immediately after your initial guess for t (you might have to change the initial guess if you want the result to represent the second peak on your graph though).

Alan

[Fred_Kohlhepp]

Change the variable name for the solve block.

[MikeArmstrong]

Of course that works I thought he wanted to keep the variable name.

Mike

[Einhorn]

Thanks All,

I was able to get the Maximize function to work and now I have some good options for the plots.

Mike