Adding two strings same row size

Question

Bastiaan Pierik 2021-1-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/725817-adding-two-strings-same-row-size

评论： Stephen23 2021-1-27

First string presents the name of the sensors to be measured: And are separated by semicolons.

str='TC1;TC2;TC3;TC4;C1;C2;C3;C4'

Second string are 8 rows separated by str2= randi([-10,80],20,8)

I had some problems with rand and tells me the rand can’t produce a scalar,

Second problem is adding both both columns with the same length on top of each other

I would like to use join,I get the following error I don’t understand. I am running this on Matlab mobile.

totalstr=join(output_str,str2,'delimiter') Error using join (line 73) Dimension argument must be a positive integer scalar within indexing range.

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Stephen23 2021-1-27

Bastiaan Pierik's incorrectly posted and accepted "answer" moved here:

Many thanks for all the replies! So there are two methods to do this.

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Answer 1

Star Strider 2021-1-24

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To use the join function, your data must first be present as table objects.

Fortunately, that is not necessary. Just use array2table:

str={'TC1','TC2','TC3','TC4','1','C2','C3','C4'};
str2= randi([-10,80],20,8);
T = array2table(str2, 'VariableNames',str);

That should do what you want.

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Star Strider 2021-1-24

编辑：Star Strider 2021-1-25

在 MATLAB Online 中打开

My pleasure!

EDIT — (25 Jan 2021 at 12:25)

If you have a time (datetime) vector and you want to include it as the first column of the table, it is easy to concatenate it:

str={'TC1','TC2','TC3','TC4','1','C2','C3','C4'};
str2= randi([-10,80],20,8);
T = array2table(str2, 'VariableNames',str);
DT = table(datetime('now') + days(1:size(T,1)).', 'VariableNames',{'Date_Time'});
T = [DT T]

producing:

T =
  20×9 table
         Date_Time          TC1    TC2    TC3    TC4    1     C2    C3    C4
    ____________________    ___    ___    ___    ___    __    __    __    __
    26-Jan-2021 05:22:57    52     61      0      51    -2    79    44    59
    27-Jan-2021 05:22:57     2     23     61      29     2     5    20    57
    28-Jan-2021 05:22:57    55      8     16      31     5    13    17    57
    29-Jan-2021 05:22:57     0     -3     44      45     7    26    31    -1
    30-Jan-2021 05:22:57     0     60     77      -5    18    -4    28    52
    31-Jan-2021 05:22:57    48      8     29      18    18    52    22    32
    01-Feb-2021 05:22:57    19     25     53      60     9    26    40     9
    02-Feb-2021 05:22:57    49     40     58      53    12    79    57    -2
    03-Feb-2021 05:22:57    58     10     29       1    71    26    28    64
    04-Feb-2021 05:22:57    43     48     49       1    53    46    29     5
    05-Feb-2021 05:22:57    57     34     -1      -2    40     4     1     4
    06-Feb-2021 05:22:57    11      3     74     -10     6    24    -8    50
    07-Feb-2021 05:22:57    56     61      7      28     9     4    16    71
    08-Feb-2021 05:22:57    78     -1     14      49    -3    58    18    37
    09-Feb-2021 05:22:57    68     16     62      55    73    69    49    53
    10-Feb-2021 05:22:57    -3     11     34      38    54    21    77     3
    11-Feb-2021 05:22:57    23     38     59      -1    40    52    75    76
    12-Feb-2021 05:22:57    23     -2     26      47    18    16    31    39
    13-Feb-2021 05:22:57    52     26     14       1     5    38    11    51
    14-Feb-2021 05:22:57    44     -1     -7       2    46    65    59    -7

.

Bastiaan Pierik 2021-1-25

Ok, that’s nice to know, I thought I had to make a another array and join them together like with outerjoin, I am getting errors I doing this. The first two inputs must be tables

Star Strider 2021-1-25

Thank you!

It is only possible to join table objects, at least using that function.

(Note — There are several join functions, such as the one I refer to in this sentence that applies to string arrays. The functions themselves determine what version of the function to use, depending on the arguments provided.)

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Answer 2

Cris LaPierre 2021-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/725817-adding-two-strings-same-row-size#answer_605332

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What are you trying to create?

The issue is you are mixing data types in an array. I think the way would do this is to use a table.

output_str={'TC1' 'TC2' 'TC3' 'TC4' 'C1' 'C2' 'C3' 'C4'};
str2= randi([-10,80],20,8);
totalstr = array2table(str2,'VariableNames',output_str)
totalstr = 20x8 table
TC1TC2TC3TC4C1C2C3C4________________________

   55     -9     62      55     -2     72     15
   79     20     48      16     22      1    -10
    6     59     63      47     -1     31     15
   50     42     -5      -8     43     79     67
    -9      2     23     78     -10     62    -10     73
    1     39     76      -4     -2     37     21
   74     16     -3       1     76     50     18
   33      6     10      56     64     20     58
   22     26     -8      11     68     43     29
   13     31     46      -6     19      5     50
    8     47      5      53     18      0     45
    4      0      2      59     57     18    -10
   20     73     44      -6     31     30     55
   28      9     50      68    -10     -8     53
   68     33     79      46     65     77     71
   -4     65     27      -7     23     48     76

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Bastiaan Pierik 2021-1-25

Hi Cris,

What I am trying to do is to get a substitute for understanding reading out my arduino directly and the data from a txt file. To do so I have to create a substitute table that resembles the data I am collecting from my microprocessor. I am working from my cellphone because I am not connected to the Matlabserver at the moment. Second part is iPhones don’t have access to files that are readout on the directory, third the buffer in Matlab isn’t to big handling large quantities of data.

What I would like to do is read out the uC

TC1;TC2;TC3;TC4;C1;C2;C3;C4' Separated by ;

Below the each temperature and current sensor I have the variables from my arduino

Like:

46 55 -9 62 55 -2 72 15 16 79 20 48 16 22 1 -10 46 6 59 63 47 -1 31 15 52 50 42 -5 -8 43 79 67 -9 2 23 78 -10 62 -10 73 62 1 39 76 -4 -2 37 21 0 74 16 -3 1 76 50 18 50 33 6 10 56 64 20 58 40 22 26 -8 11 68 43 29 5 13 31 46 -6 12 36 48

Do I have to convert the variables first to a str2double? and separate the temperatures on ; or white space?

In generell is a txt file a string or how does Matlab know it is a double?

Thanks for your time and reading this:)

I would like to do some data recording and compare measurements with theory

Cris LaPierre 2021-1-25

Share an example of the text file you are trying to read. Note that I am using my laptop with the full version of MATLAB, not MATLAB Mobile.

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Adding two strings same row size

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