print()错误:“输出参数"varargout" (可能还有其他)(未分配) [英] Error with print(): "Output argument "varargout" (and maybe others) not assigned"

问题描述

我一直试图在MATLAB中编写一个简单的脚本来绘制图像，询问用户是否要将其打印到文件中，然后(如果是)执行此操作.但是，我在print()函数中遇到了一个奇怪的错误.这是我的代码:

I have been trying to write a simple script in MATLAB that plots an image, asks to user if they want to print it to a file, and (if yes) does this. However, I have met a strange error with the print() function. Here is my code:

plot(X, Y, 'red');

choice = input('Do you want to print to file this 2D image ? [y/n] ', 'y');

if(choice=='Y' || choice=='y')
{
    print(hFig, '-dpng', strcat(filename, '.png'));
}

如果正在运行，它将停止在if语句内，并显示错误:

If running, it stops inside the if statement with the error:

==>中的错误打印为161 err.message ='';

Error in ==> print at 161 err.message='';

???在输出过程中未分配输出参数"varargout"(可能还有其他参数) 调用"C:\ Programmi \ MATLAB \ R2010a \ toolbox \ matlab \ graphics \ print.m>打印".

??? Output argument "varargout" (and maybe others) not assigned during call to "C:\Programmi\MATLAB\R2010a\toolbox\matlab\graphics\print.m>print".

在30次打印时==>直方图错误(hFig，'-dpng'，strcat(filename，'.png'));

Error in ==> istogramma at 30 print(hFig, '-dpng', strcat(filename, '.png'));

为什么会出现此错误，如何避免这种情况?

Why am I getting this error and how can I avoid this?

推荐答案

您的带有{和}的if代码似乎很奇怪，在MATLAB中{和}用于单元格数组和单元格数组索引，不用于代码结构化.此外，input的第二个参数必须为's'，而不是像您一样的'y'.

Your if code with { and } seems strange, in MATLAB { and } are used for cell arrays and cell array indexing, not for code structuring. Further, the second argument for input must be 's', not 'y' as you have.

固定代码:

choice = input('Do you want to print to file this 2D image ? [y/n] ', 's');

if(choice=='Y' || choice=='y')
    print(hFig, '-dpng', strcat(filename, '.png'));
end

编辑:继续询问直到用户用"y"，"Y"，"n"或"N"回复:

to keep asking until user responds with 'y', 'Y', 'n' or 'N':

choice = '';
while ~ismember(choice, {'y', 'Y', 'n', 'N'})
    choice = input('Do you want to print to file this 2D image ? [y/n] ', 's');
end

if(choice=='Y' || choice=='y')
    print(hFig, '-dpng', strcat(filename, '.png'));
end

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