Question

Question 1: Creating a user-defined function Write a user-defined MATLAB function named PBTask4pl_f.m for the following math function with x the input argument and y the output y(x)=0.8x4-13x2-5x The function should work for x being a scalar or a vector. Write a script file named PBTask4pl.m to a) Use the function to calculate y(3) and y(5) and display the results in command window b) Use the function to make a plot of the function y(x) for -5:5: x 5:5. Label the x-axis and y-axis of the plot like the one as follows. 200 150 100 50 -50 100 -5 0 Input x

Answer 1

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CODE:

2nd file :

y3=PBTask4pl_f(3)
y5=PBTask4pl_f(5)
x=[-5:0.1:5];
y=PBTask4pl_f(x);
plot(x,y)
xlabel('input x')
ylabel('output y=0.8x^4-13x^2-5x')

1st function file:

function y=PBTask4pl_f(x)
y=0.8*x.^4-13*x.^2-5*x;
end