how to use plotyy with x-axis cell data type ruther than double.

I would like to plot a double axis figure using plotyy. the x-axis is cell type while the two y-axises are double type

x={10:00; 11:00; 12:00; 13:00}

y1=[1 2 3 4]

y2=[4 5 6 7]

Answer 1

[Voss]

I assume that x is not a cell array of empty arrays, as in:

x={10:00; 11:00; 12:00; 13:00}

x = 4×1 cell array
    {1×0 double}
    {1×0 double}
    {1×0 double}
    {1×0 double}

but rather a cell array of datetimes, as in:

x=num2cell(datetime({'10:00'; '11:00'; '12:00'; '13:00'},'InputFormat','HH:mm','Format','HH:mm'))

x = 4×1 cell array
    {[10:00]}
    {[11:00]}
    {[12:00]}
    {[13:00]}

In that case, you can plot like this:

y1=[1 2 3 4]

y1 = 1×4

1 2 3 4

y2=[4 5 6 7]

y2 = 1×4

4 5 6 7

x_plot = [x{:}]

x_plot = 1×4 datetime array
   10:00   11:00   12:00   13:00

plotyy(x_plot, y1, x_plot, y2)

[Elias Salilih]

I have cell array of this kind

tim =

'10:00'

'10:15'

'10:30'

'10:45'

'11:00'

'11:15'

'11:30'

'11:45'

'12:00'

'12:15'

'12:30'

'12:45'

'13:00'

'13:15'

'13:30'

'13:45'

'14:00'

When I try to convert to daytime array with this code (using matlab 2014)

x_plot= [tim{:}]

I got this kind of output, it take all array as a single. there is no space

10:0010:1510:3010:4511:0011:1511:3011:4512:0012:1512:3012:4513:0013:1513:3013:4514:00

[Voss]

% a cell array of character vectors:
tim = {
    '10:00'
    '10:15'
    '10:30'
    '10:45'
    '11:00'
    '11:15'
    '11:30'
    '11:45'
    '12:00'
    '12:15'
    '12:30'
    '12:45'
    '13:00'
    '13:15'
    '13:30'
    '13:45'
    '14:00'
    };

% convert to a datetime array:
x = datetime(tim,'InputFormat','HH:mm');

% some y values to plot with
y1=1:numel(x); 
y2=3:numel(x)+2;

% plot
plotyy(x, y1, x, y2)

[Voss]

@Elias Salilih: Did this answer work for you?