# vertical concatenate strings in msgbox

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Jason on 28 Jan 2023
Edited: Jason on 28 Jan 2023
Hello,I cant understand why this vertical concatenation of strings isn't working.
%Get info from video
D=['Duration(s): ',num2str(v.Duration,'%.2f')]
B=['BitsperPixel: ',num2str(v.BitsPerPixel)]
F=['FrameRate: ',num2str(v.FrameRate)]
N=['Num Frames: ',num2str(v.NumFrames)]
mstr=([D;F;B;N])
f = msgbox(mstr,'icon','help');
waitforbuttonpress; %Block matlab until msgbox button is pressed
Gives an error: Dimensions of arrays being concatenated are not consistent

Caitlin O'Brien on 28 Jan 2023
Edited: Caitlin O'Brien on 28 Jan 2023
Each one of those isn't a string. If you look at D, F, B, and N in your workspace they are character vectors. For example, if I choose a value for duration:
D = ['Duraction(s): ', num2str(100)];
ischar(D)
ans = logical
1
length(D)
ans = 17
D is as long as however may characters it has. That would mean that each of the vectors your concatenating would need to have the same number of characters.
But if I use "string" instead of 'character'
D=["Duration(s): ",num2str(100)];
isstring(D)
ans = logical
1
length(D)
ans = 2
Each vector will have a length of 2. If you want Duration and num2str to be together in one cell, try using strcat()
D=strcat("Duration(s): ",num2str(100));
B=strcat("BitsperPixel: ",num2str(1000));
F=strcat("FrameRate: ",num2str(10000));
N=strcat("Num Frames: ",num2str(1000));
mstr=([D;F;B;N])
mstr = 4×1 string array
"Duration(s): 100" "FrameRate: 10000" "BitsperPixel: 1000" "Num Frames: 1000"
Jason on 28 Jan 2023
Edited: Jason on 28 Jan 2023

Sulaymon Eshkabilov on 28 Jan 2023
Here is the corrected code:
%Get info from video
D=['Duration(s): ',num2str(v.Duration,'%.2f')]
B=['BitsperPixel: ',num2str(v.BitsPerPixel)]
F=['FrameRate: ',num2str(v.FrameRate)]
N=['Num Frames: ',num2str(v.NumFrames)]
mstr=({D;F;B;N}) % Use braces
f = msgbox(mstr,'icon','help');
waitforbuttonpress; %Block matlab until msgbox button is pressed

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