writematrix: Invalid parameter name: WriteMode.

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Erik Taurus 2020-4-22

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/519922-writematrix-invalid-parameter-name-writemode

评论： Sue-Jin Lin 2021-8-13

采纳的回答： Adam Danz

在 MATLAB Online 中打开

Matlab R2019b

For some reason this doesn't work for me.

I'm following the example here:

https://se.mathworks.com/help/matlab/ref/writematrix.html

M2 = [5 10 15 20 25; 30 35 40 45 50];
writematrix(M2,'M.xls','WriteMode','append');

Result:
Error using writematrix (line 134)
Invalid parameter name: WriteMode.

Using the example with no extra parameters

writematrix(M2,'M.xls');

Works without problem

[Edit]

From the page: Introduced in R2019a

采纳的回答

Adam Danz 2020-4-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/519922-writematrix-invalid-parameter-name-writemode#answer_427662

WriteMode was not available in r2019a. Here's the documentation for writematrix r2019a.

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Adam Danz 2020-4-22

"I was living under the impression that everthing on the page was avaiable for the version at the bottom of the page."

The release number at the bottom of the documentation just shows when the function was released. When an update contains a new feature such as WriteMode, there are three ways I know of to determine when the new feature was released.

Look it up in the Release Notes as Steven Lord suggested. This often requires digging and some of the smaller changes, I've found, aren't mentioned or I haven't been able to find them in the release notes.
Looking up the function in earlier version of the archives. With just a few clicks and a function search, you can quicly see the older versions of the documentation for a function but you still have to read through >1 version to find differences.
If you have access to older versions of Matlab, you can run the function and compare outputs or error messages.

I really wish each page of the documentation contained a drop down menu containing releases starting with the first release for a function and that we could simply select an older release to immediately open the archived page for that function. This would solve a lot of problems, especially for newer users not using the latest release. Shout-out to the documentation team :)

Erik Taurus 2020-4-27

Thanks again ^^

Sue-Jin Lin 2021-8-13

I had the same issue with WriteMode in the same version of Matlab. Then I created a table using mytable = table(mydata1, mydata2); and then used writetable(mytable,'myresults.txt') to save it.

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