![]() Thus the test (x > 0.5) returns a constant, either 0 or 1. The function is as follows: if 0 < t < 2, 4. The key to creating the piece-wise function is to replace the if condition by a vectorized >.If you want to get deep into Matlab's symbolic math, you can create piecewise functions using MuPAD, which are accessible from Matlab – e.g., see my example here. The key to creating the piece-wise function is to replace the if condition by a vectorized >.By calling y x > 1 on some array x, the output y will be an array of the same size as x, with a logical True if the corresponding element in x is larger than 1, and a False otherwise. The simple way to define a piecewise constant function like yours is to use a logical operator. So basically I have to graph a piecewise function using vector operations, simple enough. Thus, piecewise mimics an if-else ladder. In your case, x is obviously not "always" on one side or the other of zero, but you may still find this useful in other cases. A piecewise expression returns the value of the first true condition and disregards any following true expressions. To add to comment, you should convert the output of any logical comparison to symbolic before using isAlways: isAlways(sym(x<0)) In Matlab R2012a+, you can take advantage of assumptions in addition to the normal relational operators. You can shift it to compare values other than zero. Yes, the Heaviside function is 0.5 at zero – this gives it the appropriate mathematical properties. You can also take advantage of the heaviside function, which is available in much older versions. In such an old version of Matlab, you may want to break up your piecewise function into separate continuous functions and solve them separately: syms x This MATLAB function returns the piecewise expression or function pw whose value is val1 when. A symbolic method is only needed if, for example, you want a formula or if you need to ensure precision. Look at fzero and fsolve amongst many others. ![]() First, make sure symbolic math is even the appropriate solution method for your problem. I am trying to generate a piecewise symbolic function in Matlab.
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