incomplete command in TeX text string

function []=printpowerf(x,y,z)
%this function print a power function onto the plot
%x and y are coordinates about where you want to put the graph
%z is the the coefficients containing alpha and beta of the power fucntion.
string1=['y=',z(1),'*x^',z(2)];
text(x,y,string1);
end

I'm trying to create a function to help me draw equations on plots. Codes above doesn't draw z values out and command window says incomplete command in TeX text string

Answer 1

[Walter Roberson]

string1 = sprintf('y = %f * x^{%f}', z(1), z(2))

Remember, using [] concatenation of a numeric value against a string is like using char() on the numeric values, and that means "look in the Unicode tables" rather than "format a number to be printable". Like char(10) does not mean '10', it means Unicode character #10, newline.