matlab-如何将.mat文件中的数据导入并绘制到x和y变量中?

尝试以下操作:

load figureinfo.mat; %# assume this contains a matrix called figureinfo
X = figureinfo(:,1); %# numbers from all rows, column 1, into X
Y = figureinfo(:,2); %# numbers from all rows, column 2, into Y
plot(x,y,'o');

或者更简单地说,

load figureinfo.mat;
plot(figureinfo(:,1), figureinfo(:,2), 'o');

如果你不知道矩阵的名字 .mat 文件,我建议:

clear %# clear all variables from workspace
load figureinfo.mat;
whos

它将显示您刚加载的内容的名称、大小和数据类型。

如果确实要在循环中提取数据,则有两个选项:

load figureinfo.mat; %# assume this contains a matrix called figureinfo
X = [];
Y = [];
for ctr = 1:length(figureinfo)
    X = [X figureinfo(ctr,1)];
    Y = [Y figureinfo(ctr,2)];
end

或者(更快,因为它不会继续重新分配 X 和 Y )

load figureinfo.mat; %# assume this contains a matrix called figureinfo
X = zeros(length(figureinfo),1);
Y = zeros(length(figureinfo),1);
for ctr = 1:length(figureinfo)
    X(ctr) = figureinfo(ctr,1);
    Y(ctr) = figureinfo(ctr,2);
end