glm predict on new data

I am aware this has been asked before but I could not find a resolution.

I am doing a logit

lg <- glm(y[1:200] ~ x[1:200,1],family=binomial)

Then I want to predict a new set

pred <- predict(lg,x[201:250,1],type="response")

But I get varying error messages or warnings about the different number of
rows. I  have tried data/newdata and also to wrap in data.frame() but cannot
get to work.

Help would be appreciated.

Dirk.

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