Error Undefined function or variable
显示 更早的评论
function [p,yy1]=graph999()
f1=gcf();
x0=str2num(char(inputdlg('Enter x0','Enter parametr',2,{'0'},'on')));
if (x0<-2)|(x0>6)
msgbox('x0 should be between -2 and 6','Results')
else
y0=str2num(char(inputdlg('Enter y0','Enter parametr',2,{'0'},'on')));
if (y0<-5)|(y0>6)
msgbox('y0 should be between -2 and 6','Results')
else
k=str2num(char(inputdlg('Enter k','Enter parametr',2,{'0'},'on')));
p=cos(y)+x.*y;
yy1=ygr(x0,y0,k);
end
end
function yy=ygr(X,Y,k)
x=-2:0.5:6;
y=-5:0.5:6;
[X,Y]=ndgrid(x,y);
Z=(X^2).*sin(Y)+k;
surf(X,Y,Z);
yy=Z;
It doesn't work with error
Undefined function or variable 'y'.
Error in graph999 (line 15)
p=cos(y)+x.*y;
What should I do for correct working?
采纳的回答
madhan ravi
2018-11-25
编辑：madhan ravi
2018-11-25
function graph999 %main function
f1=gcf();
x0=str2double(char(inputdlg('Enter x0','Enter parametr',2,{'0'},'on')));
if (x0<-2)|(x0>6)
msgbox('x0 should be between -2 and 6','Results')
else
y0=str2double(char(inputdlg('Enter y0','Enter parametr',2,{'0'},'on')));
if (y0<-5)|(y0>6)
msgbox('y0 should be between -2 and 6','Results')
else
k=str2double(char(inputdlg('Enter k','Enter parametr',2,{'0'},'on')));
[x,y]=ygr(k); %sub function call inside main function
end
end
function [x,y]=ygr(k) %subfunction definition
x=-2:0.5:6;
y=-5:0.5:6;
[X,Y]=ndgrid(x,y);
Z=(X.^2).*sin(Y)+k;
surf(X,Y,Z);
yy=Z;
end
end
example of surface created:
3 个评论
Mariya Shilovskaya
2018-11-25
编辑：Mariya Shilovskaya
2018-11-25
Stephen23
2018-11-25
It is recommended to use str2double rather than str2num (which hides an eval call inside).
madhan ravi
2018-11-25
编辑：madhan ravi
2018-11-25
Anytime :) ,
Another easy way to produce surface:(requires symbolic toolbox)
syms x y
k=input('k value ? ')
ezsurf(x^2*sin(y)+k)
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Data Type Identification 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
