basic error, help me

x = linspace(20,100000); 
y = 20*log10(1./(1+(2*(3.14)*(x)*(985.1)*(59*10.^-9)-(985.1/(2*(3.14)*(x)(4.7*10.^-3))).^2).^0.5);
plot(x,y)

If it write like this there is error like the below, whats the matter? Can you mend it??

Thans

error: parse error:

syntax error

>>> y = 20*log10(1./(1+(2*(3.14)*(x)*(985.1)*(59*10.^-9)-(985.1/(2*(3.14)*(x)(4.7*10.^-3))).^2).^0.5);

^

error: 'y' undefined near line 1, column 1

Answer 1

[Stephan]

2 closing brackets missing, one '*' operator missing, one times use './' instead of '/':

x = linspace(20,100000); 
y = 20*log10(1./(1+(2*(3.14)*(x)*(985.1)*(59*10.^-9)-(985.1./(2*(3.14)*(x)*(4.7*10.^-3))).^2).^0.5));
plot(x,y)

Answer 2

[KSSV]

x = linspace(20,100000); 
y = 20*log10(1./(1+(2*3.14*x*985.1*(59*10.^-9)-(985.1./(2*3.14*x*(4.7*10.^-3))).^2).^0.5));
plot(x,y)

[whiyan]

this is also correct. thanks a lot~~~

Answer 3

[Torsten K]

Is this what you are looking for?

clearvars;
x = linspace(20,100000); 
y = 20*log10(1./(1+(2*3.14*x*985.1*(59*10.^-9)-(985.1./(2*3.14*x*4.7*10.^-3))).^2).^0.5);
plot(x,y)

If not, please enter the equation with the formula editor:

[whiyan]

this efforts helped me and appeciate it~~~