MATLAB: Error: Line: 9 Column: 19 Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

functionMATLABmatlab functionplotsketch

clear all

close all

x=-2:0.1:2;

y=exp(x^2)*cos(20x);

plot(y,x)

xlabel('x')

ylabel('y')

title('y=exp(x^2)*cos(20x) in the range of x=-2:0.1:2')

grid on

Trying to write a script to compute the function y=exp (x2)*cos (20x) in the range x= -2: 0.1:2. and plot a subsequent graph with the results.

 x=-2:0.1:2;
 y=exp(x.^2).*cos(20.*x);
 plot(y,x)

Connected lines 
x=-1:0.01:1;
y(x>=-1 & x<0)=-1-x(x>=-1 & x<0);
y(x>=0 & x<=1)=1-x(x>=0 & x<=1);
plot(x,y)

Alternative, not connected lines

x1=-1:0.01:0-0.01;
x2=0:0.01:1;
y1(x1>=-1 & x1<0)=-1-x1(x1>=-1 & x1<0);
y2(x2>=0 & x2<=1)=1-x2(x2>=0 & x2<=1);
plot(x1,y1)
hold on
plot(x2,y2,'r')

Make sure the period is adjacent to the asterisk:

y = cos(20*x).* exp(x.^2);