Interpolation of data at each specific value in the variable

I have a data set of distance, speed and acceleration and I'm looking for a method to interpolate the data and get a new interpolated variable of distance - speed and another one for distance - acceleration. The issue is that I want the interrpoldation to be exactly at each 1 meter (i.e. 1m, 2m, 3m, 4m ......) also the data is arranged in ascending order but not fixed slope so i can't say interpolate after each 10th value. my question is how can I interpolate the data with respect to distance at each 1 meter in other words how to ask the matlab to interpolate the distance with speed when the distance reached 1 meter and take the distance exactly after or before the first time he reached 1 meter (i.e. in case of having 0.9 - 1.2- 1.5, thus it should take 1.2 and (0.9 or 1.5))

Answer 1

[Ameer Hamza]

See interp1(): https://www.mathworks.com/help/matlab/ref/interp1.html. You can probably do something like this

distance; % your distance vecto
speed; % your speed vecto
distanceQ = 1:max(distance); % new distance vector with step size of 1m
speedQ = interp1(distance, speed, distanceQ);

[Abdulkarim Almukdad]

Thanks for your answer but I'm having an error:

Error using matlab.internal.math.interp1

Sample points must be unique and sorted in

ascending order.

[Ameer Hamza]

Can you attach your data in a .mat file?

[Abdulkarim Almukdad]

Thanks Ameer Hamza I have solved this issue by adding the below loop to eliminite the issue of having same numbers

for b=1:length(x)

    m(b)=x(b)+ b*1E-10; %add the variable x to m and add 1E-10 to the nubmers
    n(b)=y(b)+ b*1E-10; %add the variable y to n and add 1E-10 to the nubmers
    
end

[Ameer Hamza]

I am glad that it worked out!

[Abdulkarim Almukdad]

can you help me with the other question ? I just want a function to make the data from the csv file at 1 column go to the rest of the columns just like the function (text to columns) in excel.