how to tune the parameters of the trimf grad function?

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Jinghua Li 2017-1-11

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https://ww2.mathworks.cn/matlabcentral/answers/319920-how-to-tune-the-parameters-of-the-trimf-grad-function

I want to tune the parameters(a,b,c) of the trimf grad function with steepest descent method,but due to grad function is a segmentation function, when a=<x<=b c is not exist and a is not exist when b=<x<=c,i can't get the gradient of the parameter c when a=<x<=b and the gradient of the parameter a when b=<x<=c,do you have better method to solve the problem? thank you advanced.