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Error finding and graphing max values of data (Error using horzcat Dimensions of matrices being concatenated are not consistent. )

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I'm trying to graph multiple sets of .csv data and display the max value for each data set on the graph itself. This has worked for all of my data sets except for one, which I keep getting the error "Error using horzcat Dimensions of matrices being concatenated are not consistent. The following is the code I've been using for two data sets, which I have attached to the post. TEK00055 is the one with errors and TEK00057 is the one without issues.
figure;
tmd=load('TEK00055.CSV');
x=5.+tmd(:,1);
y=5.*tmd(:,2);
plot(x,y)
xlabel('Time (s)')
ylabel('disp (mm)')
indexmax = find(max(y) == y);
xmax = x(indexmax);
ymax = y(indexmax);
strmax = ['Maximum = ',num2str(ymax)];
text(xmax,ymax,strmax,'HorizontalAlignment','right');
figure;
tmd=load('TEK00057.CSV');
x=5.+tmd(:,1);
y=5.*tmd(:,2);
plot(x,y)
xlabel('Time (s)')
ylabel('disp (mm)')
indexmax = find(max(y) == y);
xmax = x(indexmax);
ymax = y(indexmax);
strmax = ['Maximum = ',num2str(ymax)];
text(xmax,ymax,strmax,'HorizontalAlignment','right');
For the TEK00057 data, a graph comes out exactly how I want, with the maximum y-value being labelled, but the TEK00055 data is giving me errors. From looking through the excel files, i can't find any major differences between the two. Any help would be appreciated.
  6 Comments
Zaman Chini
Zaman Chini on 9 Jul 2018
You were correct. I had to designate xmax=xmax(1) and ymax=ymax(1), so that there would only be one of each values in the text line. Someone posted an answer, and I gave that credit, but thank you for helping me with my issue.

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Accepted Answer

Unai San Miguel
Unai San Miguel on 9 Jul 2018
Your TEK00055.csv data has three data points with maximum y-values:
>> xmax
xmax =
6.8720
6.8730
6.9890
>> ymax
ymax =
0.2380
0.2380
0.2380
And then
>> num2str(ymax)
ans =
3×5 char array
'0.238'
'0.238'
'0.238'
is a 3x1 array, which cannot be horizontally concatenated with a single string 'Maximum = '.
You can use ['Maximum = ', str2num(ymax(1))] to display the first maximum occurrence, or any other solution.
  1 Comment
Zaman Chini
Zaman Chini on 9 Jul 2018
What you and Geoff Hayes said about designating ymax(1) cause I had multiple values in ymax that were the same was correct. What I ended up doing to get a reasonable result is
figure;
tmd=load('TEK00055.CSV');
x=5.+tmd(:,1);
y=5.*tmd(:,2);
plot(x,y)
% xlim([0,10])
xlabel('Time (s)')
ylabel('disp (mm)')
indexmax = find(max(y) == y);
xmax = x(indexmax);
ymax = y(indexmax);
xmax = xmax(1);
ymax = ymax(1);
strmax = ['Maximum = ',num2str(ymax)];
text(xmax,ymax,strmax,'HorizontalAlignment','right');
I had to designate the xmax=xmax(1) and ymax=ymax(1), so that there was only one of each value to be noted in the text line.

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