How to add labels to the LEFT of a table

Question

Amanda 2021-4-25

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/813010-how-to-add-labels-to-the-left-of-a-table

评论： Star Strider 2021-4-26

Let's say we have a random table

T = readtable('indoors.csv');
head(T,3)
ans=3×3 table
           Time            Humidity    AirQuality
    ___________________    ________    __________
    2015-11-15 00:00:24       36           80    
    2015-11-15 01:13:35       36           80     

The way we have VariableNames as'time' 'humidity' etc written, I want similar labels on the y-axis

Except instead of regular labels, I was labels like 'x[n]' and 'h[x]', but without it actually solving or giving me a concatenation error.

How can I do this?

or even just get me on the right track without doing x[n] stuff, please

This is my goal:

                    Time            Humidity    AirQuality
             ___________________    ________    __________
x[n]         2015-11-15 00:00:24       36           80    
h[n]         2015-11-15 01:13:35       36           80    

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Answer 1

Star Strider 2021-4-25

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/813010-how-to-add-labels-to-the-left-of-a-table#answer_684535

在 MATLAB Online 中打开

I’m not certain what you want.

Experiment with this —

Time = (datetime('2015-11-15 00:00:24')+hours(0:1.1:5.5)).';
Humidity = randi([1 100],size(Time));
AirQuality = randi([1 100],size(Time));
AirTable = table(Time,Humidity,AirQuality);
AirTable.Properties.RowNames = compose('x[%d]',1:numel(Time))
AirTable = 6×3 table
                    Time            Humidity    AirQuality
            ____________________    ________    __________

    x[1]    15-Nov-2015 00:00:24       26           35    
    x[2]    15-Nov-2015 01:06:24       10           30    
    x[3]    15-Nov-2015 02:12:24       38           85    
    x[4]    15-Nov-2015 03:18:24       12           93    
    x[5]    15-Nov-2015 04:24:24       68           79    
    x[6]    15-Nov-2015 05:30:24       72           69    

See the documentation on compose for more information.

Alterrnatively, try this option —

AirTable.Properties.RowNames = compose('%s[n]','a'+randi([0 25],size(Time)));

.

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Amanda 2021-4-25

The first one worked. But I wanted custom labels for x[n] and h[n], exactly as I have written, is this possible?

I dont want x[n] to actually count...

Star Strider 2021-4-26

在 MATLAB Online 中打开

For only two rows, yes.

In that instance —

AirTable.Properties.RowNames = {'x[n]','h[n]'};

will work.

However, doing this —

xhvct = repmat({'x[n]','h[n]'},1,ceil(numel(Time)/2));
AirTable.Properties.RowNames = xhvct(1:numel(Time));

throws the error:

Duplicate table row name: 'x[n]'.

So, each row must have a unique row name, however you choose to define them.

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