How do I assign a symbolic variable only to change the variable to an array?

Hi, I am having a hard time trying to assign a symbolic variable to the input x. I am wanting to use x later in my code in its symbolic form but at exp1 I would like to assign the variable a value of an array. Any help is greatly appreciated.

    % code
%Prompting for Amplitude and Limits of Interest
        prompt = {'Enter the Value, "A",  from the form A*exp(t). Include Negative Sign if Applicable',...
            'Enter the Numerical Lower Limit Over Which to Plot the Function Segment'...
            'Enter the Numerical Upper Limit Over Which to Plot the Function Segment'};
        prompttitle = 'Information Input';
        defaultans = {'1', '0', '4'};
        answer = inputdlg(prompt, prompttitle, 1, defaultans);
        expamp2 = str2double(answer(1,1));
        explow1 = str2double(answer(2,1));
        exphigh1 = str2double(answer(3,1));

        %Defining Lower and Upper Limits Chosen in Each Iteration
        lowerlimit1 = explow1;
        upperlimit1 = exphigh1;

        Syms t 

        %Decay Constant Prompt
        prompt1 = 'Enter the Decay Constant Using the variable "/*t" and Include Positive or Negative Integers : ';
        %Prompt User to input the decay constant. This was left as a
        %command window input so that maximum variations can be inputted.
        x = input(prompt1);

        %Auto-Defining 'To' Based on Limit Selection
        To = abs(exphigh1 - explow1);
        Tolong = To*100;

        %Defining Horizontal Axis
        t = (explow1:.01:exphigh1);

        %Formatting all variable to final exp form.
        exp1=expamp2*exp(x);

        %Generalizing naming convention for subplots
        amplitude1 = exp1;
        t1 = t;        
        clc

[Eric Cheatwood]

In other words, I would like exp1 to perform calculations on the array of numbers t but I would like x to hold onto the symbolic value of t to be put through a Fourier Series later on. Thanks

Answer 1

[Walter Roberson]

Something like,

syms x
X = input(prompt1);
exp1 = subs(expamp2 * exp(x), x, X);

[Eric Cheatwood]

I'm getting an error with that method that says Entries in second argument must be scalar. Just to recap. x is a prompt that user enters a decay constant of the exponential with a value such as '-5*t'. Currently, t is defined as an array a few lines above.

[Eric Cheatwood]

Nevermind. After some messing around I figured out the problem I was having. -Placed syms t above prompt code -Redefined the array t as t1 and placed it below prompt code -Used code X = subs(x, t1); -Finally, exp1 = expamp2*exp(X);

Thanks a bunch for the help.

[Walter Roberson]

The subs(x,t1) would probably not do you any good unless you had a symbolic variable named t1

[Eric Cheatwood]

I understand what you are saying. I defined t1 as a 'double' array. x equals some symbolic equation such as '-2*t' so the t is replaced with an array t1 using the subs function to make X but the symbolic equation x can still be used later. I suppose I could equally do the job with subs(x,t,t1) Thanks again.

[Walter Roberson]

Yes, it is clearer if the variable being substituted for is specified; I myself got confused when I made the above remark.