Sudden error "Unidentified function or variable"
显示 更早的评论
Hello everyone
I've got a problem when trying to run a code today. While the code ran perfectly yesterday, it only showed "Unidentified function or variable" today. Can anybody help me with this? Thank you very much.
My code:
[X1 Y1] = Elispe(1, sqrt(4/3), 0, 0, 0, 2*pi);
Z1 = zeros(1, length(X));
Z2 = ones(1, length(X));
X = [X1;X1];
Y = [Y1;Y1];
Z = [Z1;Z2];
%figure
Purple = [0.5,0,1]
surface(X,Y,Z, 'EdgeColor',Purple);
function [X Y] = Elispe(r1,r2, h, k, a, b)
t = linspace(a, b, 50);
X = r1*cos(t) + h;
Y = r2*sin(t) + k;
end
采纳的回答
Did you read what the error message said?
Unrecognized function or variable 'X'.
Error in untitled (line 3)
Z1 = zeros(1, length(X));
So what is X? Is it X1?
Z1 = zeros(1, length(X1));
Z2 = ones(1, length(X1));
I imagine the only reason this once worked was because there was a volatile copy of X just floating around in the workspace -- probably left over from when you changed variable names or something.
2 个评论
Kyle Dalminton
2021-7-26
DGM
2021-7-26
It happens. When building stuff in a sandbox, it's helpful to run clearvars at least every now and then to make sure your code isn't relying on ephemeral variables that aren't being set by the current version of the code. If things are going to break, it's best they break while you still have your eyes and mind on it.
更多回答（1 个）
[X1 Y1] = Elispe(1, sqrt(4/3), 0, 0, 0, 2*pi);
% Z1 = zeros(1, length(X));
Z1 = zeros(1, length(X1));
%Z2 = ones(1, length(X));
Z2 = ones(1, length(X1));
X = [X1;X1];
Y = [Y1;Y1];
Z = [Z1;Z2];
%figure
Purple = [0.5,0,1]
surface(X,Y,Z, 'EdgeColor',Purple);
function [X Y] = Elispe(r1,r2, h, k, a, b)
t = linspace(a, b, 50);
X = r1*cos(t) + h;
Y = r2*sin(t) + k;
end
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