Scatter plot with categorical x axis

I need to produce scatter plot with categorical x axis.

I used this script:

figure(1)
x=['pixels'];
y=Tmean_split.pixels;
scatter(x,y)

in which the size of Tmean_split.pixels is 6*1.

I recieve this error:

Must supply X and Y data as first arguments.

Any idea why this error happening?

Answer 1

[dpb]

'pixels' isn't an allowable argument for the x value position...it's a char() array string array and that's confusing the input parser inside scatter() -- it's trying to interpret the character string argument as one of the trailing optional arguments like the colorspec or the like, but as the documentation says, the x, y data have to be supplied before any of those.

scatter() also MUST have both x and y data arguments; you can't just give it a y vector like plot(). It will accept a categorical array as the X axis value, but you'll have to define it for the six categories to which each of the y variable values belongs to do so.

[Zeynab Mousavikhamene]

What would be your solution? I need to have categorical value for X and nmerical value for Y showing the scatter values of the Ys.

[dpb]

What are the categories? You've not shown what you want the x values to be. What part does the word 'pixels' play in things here?

x='pixels';
x=categorical(cellstr(x.'))
scatter(x,rand(size(x)),'filled')

yields

but I really doubt that's what you had in mind. But, as noted above, it does illustrate that scatter will accept a categorical x value, you just have to define what those are supposed to be...

Note by default order of the categorical array is alphabetic..