I understand that you are having a 1-D array in your base workspace, that you want to import to your simulink model.
If the input is not a time-series, you can directly use the 'constant' block, with the variable name specified in the 'Constant value' field, inside the block parameters. In this case,according to your model, you will get a 2558*1 array as input at each time-step.
As an example, in the provided case, you can easily make a time-series object with the data that you have in the workspace, and the sampling time of the model. As an example, if sampleTime=0.01, and number of steps taken is 2558 , the following code can be used before running the model.
time = sampleTime*(0:numSteps-1);
You can refer to the documentation provided to get a better idea on the 'From Workspace' block.