why the save instruction not execute correctly in matlab 2013 , code is below

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mntaser salem
mntaser salem 2015-1-26
评论： mntaser salem 2015-1-26
x=100;
>> save('test.mat','x');
Error using save
Unable to write file test.mat: permission denied.
>> x=100;
>> save('test.mat','x','append');
Error using save
Variable 'append' not found.

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Image Analyst
Image Analyst 2015-1-26
Try '-append' instead of 'append'.

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