Append Data to Array of Cell

Question

Georg Söllinger 2016-11-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/311739-append-data-to-array-of-cell

评论： Georg Söllinger 2016-11-12

Hi Guys, Again I need your help. Due to any reason I cannot append data to an array in a cell within every round of a for-loop. I'd like to do the following, what should actually work, if looking at help:

R{i,7}(:,1) = [R{i,7}(:,1); (ceil(R{i,1}(j,10)/increment)*increment          :increment:floor(R{i,1}(j+1,10)/increment)*increment          )'; R{i,1}(j+1,10)];

Matlab throws the error Subscripted assignment dimension mismatch. So I tried the following, but the same error appears.

R{i,7}(:,1) = vertcat(R{i,7}(:,1), (ceil(R{i,1}(j,10)/increment)*increment          :increment:floor(R{i,1}(j+1,10)/increment)*increment          )', R{i,1}(j+1,10));

Can anyone help me with my problem? Thanks in advance!

Georg

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2016-11-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/311739-append-data-to-array-of-cell#answer_242918

编辑：Walter Roberson 2016-11-11

在 MATLAB Online 中打开

You cannot increase the number of rows in a variable by using

variable(:, column) = more_data_than_before

When you have an existing array, the : index in the first position expands to 1 : size(existing_array,1) -- a definite size, and you cannot store more data than that there.

It is only when you are storing to an array that has not been initialized that you can use : and have it build the array as big as required.

You will need to use:

newdata = [(ceil(R{i,1}(j,10)/increment)*increment          :increment:floor(R{i,1}(j+1,10)/increment)*increment          )'; R{i,1}(j+1,10)];
R{i,1}(end+1:end+size(newdata,1), 1) = newdata;

Note that if R{i,1} has more than one column, this would put 0 in those columns in the expanded rows.